Search Results — 2000 specimen records retrieved (1649 records with coordinates)
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CHSC80223  Abutilon theophrasti B. Castro; G. Kuenster 2000-7-19 1200 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Creek, and the Glenn-Colusa canal, at edge of a levee road along an un-named drainage through agricultural land. 42 Comment
  UCR201545  Abutilon theophrasti George K. Helmkamp, E. A. Helmkamp 2008-10-14 14263 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 8.4 miles north of Colusa 17 Comment
  UCD80834  Acer macrophyllum Ellen Dean; G. Harrington, J. Alderson, M. Bibbo, B. Rice 2009-3-25 5291 Colusa BLM Bear Creek (Payne) Ranch, lands to the SW of the jct of Hwys 16 and 20. Canyon to the north of Brophy Canyon. 239 Comment
  CAS-BOT-BC21709  Achillea millefolium J. Clausen 1939-6-26 1743 -2 Colusa 17 miles west of Williams, just before entering Lake County Comment
  CAS-BOT-BC21710  Achillea millefolium Roxana S. Ferris 1917-4-14 586 Colusa 5 mi. west of Arbuckle Comment
  CHSC92665  Achnatherum occidentale subsp. californicum D. Isle 2005-9-14 1175 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. 1/2 mile SE of Box Spring Trail junction on Overlook Trail. 1895 Comment
  CAS-BOT-BC29877  Achyrachaena mollis B. Ellyson; J. Hooke; D. Newman 1996-5-4 40 Colusa Bear Valley, Leesville, 1.3 mi. south fo Brim Road on Bear Valley Road; 14.7 mi. on Walker Ridge Road 414 Comment
  CAS-BOT-BC29879  Achyrachaena mollis Roxana S. Ferris 1926-4-21 6293 Colusa 3 miles west of Colusa Comment
  CDA11422  Achyrachaena mollis G. F. Hrusa, K. van Katwyk 1995-4-22 12143 Colusa Inner North Coast Ranges; Leesville Rd. approx. 4 m. NW of Hwy. 20. Comment
  JEPS36738  Achyrachaena mollis W. L. Jepson 1932-5-8 16285 Colusa Stonyford 365 Comment
  UCD135734  Achyrachaena mollis Bruce G. Baldwin 1986-4-13 598 Colusa Bear Valley, 7.3 miles north of junction with California State Highway 20 along Bear Valley Road. Comment
  CHSC94284  Acmispon americanus var. americanus Lowell Ahart 2006-8-9 13112 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  SD197771  Acmispon americanus var. americanus G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa Sacramento Valley: along CA-20, 0.2 miles east of the Sutter County line. 9 Comment
  CAS-BOT-BC479712  Acmispon brachycarpus Ann Howald 2003-6-9 2367 Colusa Inner North Coast Ranges: Indian Valley, east side of East Park Reservoir, c. 3 mi N of Lodoga, N of Last Chance camping area 378 Comment
  JEPS120969  Acmispon brachycarpus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18648 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UCSB63635  Acmispon brachycarpus Fukuyama, S. 1986-4-5 Colusa Ca 0.3 mi w of jjct of Hwys 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams 321 Comment
  CHSC101628  Acmispon denticulatus David W. Isle; Teal Richards 2002-4-18 1653 Colusa Mendocino National Forest; N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mtn.) SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg Study Plot. MDB and M. 524 Comment
  UCD66697  Acmispon denticulatus Craig D. Thomsen 2000-6-23 2385 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66709  Acmispon denticulatus Craig D. Thomsen 2001-5-24 2509 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  HSC94147  Acmispon grandiflorus G. Fred Hrusa 1998-6-19 14638 Colusa Below Fouts Springs on Fouts Springs Rd. to Stonyford. 675 Comment
  OBI59416  Acmispon grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2233 Colusa On rd above and W of Fouts Springs 762 Comment
  CHSC112313  Acmispon wrangelianus Lowell Ahart 2013-5-1 18697 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD57278  Acmispon wrangelianus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3646 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCR261721  Acmispon wrangelianus Ann Howald 2003-5-30 2355 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, Coppermine Road c. 1.2 miles north of intersection with Ruby King Rd., then c. 0.1 mile east on ranch road 397 Comment
  HSC98295  Acmispon wrangelianus D. R. Junell 1965-4-18 25 Colusa 2 mi. E on Hwy. 16 from junction with Hwy. 20 Comment
  CAS-BOT-BC107  Adenostegia palmata Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-6-17 284 Colusa near College City Comment
  CAS-BOT-BC133153  Adenostoma fasciculatum Roxana Stinchfield 1916-6-18 304 Colusa Near College City Comment
  UC217393  Adenostoma fasciculatum H. M. Hall 1919-10-5 Colusa on plains n. of town and e. of R.R. Hershey Comment
  UC71996  Adenostoma fasciculatum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD56913  Adiantum jordanii Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3516 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 318 Comment
  UCD14573  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  SFV15096  Aeschynomene rudis B. J. McCaskill, G. D. Barbe (4397) 1990-9-5 s. n. Colusa West side of Boggs Road between Dodge and Fonseca Roads. MDB&M. Comment
  SFV15097  Aeschynomene rudis B. J. McCaskill, G. D. Barbe (4397) 1990-9-5 s. n. Colusa West side of Boggs Road between Dodge and Fonseca Roads. MDB&M. Comment
  UCD104589  Aeschynomene rudis June McCaskill; with Jim Hill 1990-8-27 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  UCD104590  Aeschynomene rudis June McCaskill; with Jim Hill 1990-9-5 s.n. Colusa Colusa Co.; near Princeton in a rice field; Comment
  UCD104591  Aeschynomene rudis June McCaskill; G. D. Barbe 1990-9-5 4397 Colusa West side of Boggs Road Between Dodge and Fonseca roads; 5.6 km southwest of Princeton. Comment
  UCD104592  Aeschynomene rudis June McCaskill; G. D. Barbe 1990-9-5 4397 Colusa West side of Boggs Road Between Dodge and Fonseca roads; 5.6 km southwest of Princeton. Comment
  CAS-BOT-BC206880  Aesculus californica Roxana S. Ferris 1926-4-23 6450 Colusa On Grapevine Grade betwen Stony ford and and Sites. Comment
  HSC59124  Aesculus californica Terry Roth 1979-5-7 40 Colusa Where Hwy. 20 enters Salt Canyon along Salt Creek 122 Comment
  HSC86927  Aesculus californica Anthony J. Desch, Bryon Cariss 1988-4-16 33 Colusa 2 mi. W on Brim Rd. from corner of Brim Rd. and Bear Valley Rd. 518 Comment
  JEPS75862  Ageratina occidentalis L. R. Heckard 1974-9-10 3887 Colusa s of East Peak (along intermittent spring of upper reaches of Dark Hollow Creek); Snow Mt., Dark Hollow Creek 2011 Comment
  CHSC79649  Agoseris heterophylla L. P. Janeway; B. Castro 2000-5-2 6690 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 225 Comment
  UCD57283  Agoseris heterophylla Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3651 Colusa BLM Payne Ranch. Mouth of Craig Canyon. Along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  UCD64516  Agoseris heterophylla Craig D. Thomsen 2000-4-12 2102 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82508  Agoseris heterophylla Craig Thomsen; G. Harrington 2009-5-12 2867 a Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  OBI49665  Agoseris heterophylla var. cryptopleura A. Liston, M. Blumler 1987-4-26 667 -2 Colusa Bear Valley, Lodoga Rd, 6.6 mi S of Bartlett Springs jct Comment
  JEPS80135  Agoseris heterophylla var. heterophylla L. R. Heckard with J. Hickman 1980-7-2 5295 Colusa 10 mi w, just above Summit Spring entrance to Snow Mt. trail Stonyford; Lake County boundary 1630 Comment
  POM292576  Agoseris heterophylla var. heterophylla Lyman Benson 1933-4-16 4328 Colusa 5 miles east of Lake County line. Mt. Range: Inner N. Coast; Watershed: N. Fork Cache Creek. 457 Comment
  UCD92450  Agrostis Beecher Crampton 1958-5-19 4811 Colusa West of Lodoga. Little Stony Creek. Comment
  JEPS75878  Agrostis exarata L. R. Heckard 1974-9-10 3914 Colusa ne slope West Peak (Snow Mt); Snow Mt., West Peak 2072 Comment
  UCD163845  Agrostis exarata Craig D. Thomsen 2000-6-1 s.n. Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  JEPS73446  Agrostis variabilis L. R. Heckard 1972-7-8 3043 Colusa on ridge running se West Peak, Snow Mt. (on n side) 2011 Comment
  CHSC94474  Agrostis viridis Lowell Ahart 2006-8-9 13159 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD162995  Aira caryophyllea Craig D. Thomsen 2000-4-12 2169 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.5 mile west of Hwy 20/16 intersection. 345 Comment
  SEINET3917542  Aira caryophyllea Donald Spalinger 1974-5-4 47 Colusa St. John Mt. quad. North fork Campground on Stony Creek. 1600.; 0 Comment
  UC985656  Alisma plantago-aquatica Malcolm A. Nobs and S. Galen Smith 1949-9-9 1873 Colusa 3 mi w Williams Comment
  CAS-BOT-BC445355  Alisma plantago-aquatica Roxana Stinchfield 1916-7-11 469 Colusa Davis tule - Sycamore Slough Comment
  CHSC94417  Alisma triviale Lowell Ahart 2006-8-22 13231 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD137975  Alisma triviale P. B. Kennedy 1925-9-18 s.n. Colusa Cortena, Rice Sta. Comment
  CHSC112205  Allium amplectens Lowell Ahart 2013-5-1 18682 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  JEPS80119  Allium amplectens L. R. Heckard with J. Hickman 1980-7-1 5275 A Colusa near bottom of s side of East Peak; Snow Mt. 2042 Comment
  UCD66451  Allium amplectens Craig D. Thomsen 2000-5-11 2297 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCD81213  Allium amplectens Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5550 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destanella Flat area on the S side of Hwy. 20. 574 Comment
  UCD82390  Allium amplectens Craig Thomsen; G. Harrington 2009-5-12 2832 Colusa Colusa County. Walker Ridge. South of spur road en route to Eaton Springs, about 1/2 mile east of Walker Ridge Rd. About 100 yds south of road (ravine with spring below). 822 Comment
  UCD82518  Allium amplectens Craig Thomsen; G. Harrington 2009-5-12 2875 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  CAS-BOT-BC459582  Allium amplectens Roxana S. Ferris 1926-4-23 6578 Colusa Stonyford Comment
  UC119994  Allium amplectens T. S. Brandegee 1890-6-22 Colusa Snow Mt. Comment
  UCD141837  Allium cratericola L. K. Mann; M. D. Mann 1961-4-2 s.n. Colusa Bear Valley. 396 Comment
  CHSC100263  Allium falcifolium David Isle 1990-6-6 1518 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. Lower Summit Valley, east edge of rock outcrop. MDMB. 1670 Comment
  CHSC70819  Allium falcifolium B. Castro; D. Isle, L. Hanson, B. Corbin, E. Earl, L. Janeway 1995-4-28 565 Colusa On Walker Ridge just W of Walker Ridge Rd, ca 0.5 mi S of jcn of Walker Ridge Rd and Bartlett Springs Rd, ca 300 ft E of Lake Co. line. 716 Comment
  JEPS15563  Allium falcifolium G. Thomas Robbins with L. R. Heckard 1956-7-25 3717 Colusa slope above Dark Hollow Creek (a tributary of Middle Fork Stony Creek) (on s flank of Snow Mt. at lower end of cirque between Snow Mt. West and Snow Mt. East); Snow Mt. 1981 Comment
  JEPS73488  Allium falcifolium L. R. Heckard 1972-7-9 3100 Colusa se slope of East Peak of Snow Mt. East Peak of Snow Mt. 2011 Comment
  HSC42373  Allium falcifolium Dale McNeal 1975-5-3 1595 Colusa Above Hwy. 20, 1.0 mi. W of junction with Hwy. 16 Comment
  RSA256672  Allium falcifolium J. L. Hobson 1974-5-4 57 Colusa 0.75 mile from the junction to Indian Valley on Walker Ridge Road. 854 Comment
  UCD141802  Allium falcifolium Roman Gankin 1958-4-25 s.n. Colusa 4 miles west of Leesville, near head of Bear Valley, off road. 304 Comment
  UCD141835  Allium falcifolium L. K. Mann 1957-5-30 s.n. Colusa road from Goat Mt. Lookout to Upper Lett's Valley. 1524 Comment
  UCD141787  Allium fimbriatum M. Yamaguchi; D. Hughes, D. G. Hunt 1965-4-29 s.n. Colusa Bear Valley Road (sign to Wilbur Springs) past fenced area after leaving junction of California 16 and 20. Comment
  CAS-BOT-BC135887  Allium fimbriatum subsp. purdyi Peter H. Raven 1962-5-31 17908 Colusa State Highway 20, 2.5 miles east of Lake County line. Comment
  CHSC27630  Allium fimbriatum var. purdyi Robert A. Schlising 1978-5-13 3231 Colusa Just E of Lake County line, along Hwy 20. Comment
  HSC48164  Allium fimbriatum var. purdyi Thomas W. Nelson, Jane P. Nelson 1978-4-29 3928 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  RSA32008  Allium fimbriatum var. purdyi A. A. Heller 1942-5-29 s.n. Colusa 0.5 miles east of the Lake Co. Line Comment
  UC726499  Allium fimbriatum var. purdyi A. A. Heller 1942-5-29 16484 Colusa 1/2 mi e Lake County Line Comment
  UCD141858  Allium fimbriatum var. purdyi L. K. Mann 1958-5-3 s.n. Colusa California Highway #20 at Lake County - Colusa County Line. Comment
  UCD163228  Allium fimbriatum var. purdyi Craig D. Thomsen 2001-5-24 2511 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  UCD164168  Allium fimbriatum var. purdyi Craig Thomsen 2008-5-31 2761 Colusa Payne Ranch (Bear Creek Ranch) BLM. About 1 mile south of Hwy 20 junction, vicinity of Cowboy Camp. Comment
  UCD57292  Allium fimbriatum var. purdyi Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3663 Colusa BLM Payne Ranch. Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. Along unimproved road. 328 Comment
  UCR198144  Allium fimbriatum var. purdyi Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3672 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon, above Thompson Creek 366 Comment
  UCR198151  Allium fimbriatum var. purdyi Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3663 Colusa BLM Payne Ranch, Craig Canyon, west of Hwy 16, c. 2 road mi south of junction of Hwy 20 and Hwy 16. Along unimproved road 329 Comment
  SBBG128800  Allium fimbriatum var. purdyi L. Ahart, J. Dittes, J. Guardino 2013-4-26 18641 Colusa rocky serpentine outcrop on N side of St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  SEINET194974  Allium purdyi A. A. Heller 1940-5-6 15579 Colusa Summit of the grade on State Highway # 20 , at the Lake County line, 232 Comment
  CDA11415  Allium serra G. F. Hrusa, K. van Katwyk 1995-4-22 12136 Colusa Inner North Coast Ranges; S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  JEPS56391  Allium serra W. I. Follette 1935-4-1 Colusa 13.7 mi sw Williams (8.1 mi e of Colusa-Lake county line) Comment
  POM174564  Allium serra Roxana S. Ferris 1926-4-23 6429 Colusa Near summit on grade. Williams- Stonyford Road Comment
  UCD57665  Allium serra Erica A. Smith; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, just west of where road crosses Craig Creek. 313 Comment
  CAS-BOT-BC475546  Allium serra A. A. Heller 1919-5-10 13112 Colusa Grade east of Leesville in the oak belt on open grassy slopes. Comment
  CAS-BOT-BC475549  Allium serra James R. Shevock 1973-4-14 2551 Colusa Occasional along Leesville Road; Northern Coast Ranges Comment
  HSC71314  Allium serra Thomas W. Nelson, Jane P. Nelson 1979-4-11 4611 Colusa Along Leesville to SR 20 cutoff 5 mi. E of Leesville Comment
  SEINET3879172  Allium serra D. W. McNeal, David Isle 1991-5-22 3821 Colusa On a steep road bank above Hwy #162, 4.3 mi E of the Stony Creek Bridge N of Elk Creek.; 0 Comment
  SEINET3880036  Allium serra D. W. McNeal 1988-3-31 3241 Colusa Dry clay soil on a grassy road bank above Hwy #116, 3.3 mi S of the jct. of Hwy #20.; 0 Comment
  UCD138639  Allium serra C. B. Shah 1960-4-10 11 Colusa Bear Valley, 10 miles northwest of junction of State Highways 16 and 20. 304 Comment
  UCD141801  Allium serra L. K. Mann 1960-4-10 s.n. Colusa along State Highway #16 at south end of Bear Valley. Comment
  UCD141808  Allium serra L. K. Mann 1958-5-3 s.n. Colusa 0.2 mi. toward Clear Lake from junction of California Highway #16 and #20. Comment
  CHSC90778  Allophyllum divaricatum D. Isle 2002-4-18 182 Colusa Mendocino National Forest--North Coast Ranges. Upper Lake Watershed. S. of Bathhouse Trail Rd. 17N51, no. of Fouts Springs. 548 Comment
  SEINET14407744  Allophyllum gilioides subsp. violaceum R. R. Halse 2010-3-25 7849 Colusa Along State Hwy 20 in Salt Canyon, ca 10.7 miles SW of its junction with I-5 at Williams. 154 Comment
  SEINET3872990  Allophyllum gilioides subsp. violaceum Richard R. Halse 2010-3-25 7849 Colusa Along State Hwy. 20 ca 10.7 miles southwest of its junction with Interstate Hwy. 5 at Williams; in Salt Canyon.; 0 154 Comment
  JEPS75837  Alnus incana subsp. tenuifolia L. R. Heckard 1974-9-11 3942 Colusa e. Foutch Camp (near upper crossing of Trout Creek, Snow Mt.); Snow Mt. 1859 Comment
  JEPS108914  Alnus rhombifolia Lowell Ahart 2006-8-9 13108 Colusa Gravel bar on the north side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  UC1051700  Alnus rhombifolia Helen K. Sharsmith 1953-6-21 4310 Colusa near Stonyford; Inner North Coast Ranges, Big Stoney Creek 518 Comment
  CDA25631  Amaranthus blitoides G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14264 Colusa Sacramento Valley; Along River Road (generally following the Sacramento River), 8.4 miles north of Colusa. Comment
  CDA19687  Ambrosia confertiflora D. Brown 2001-10-17 PDR 024367 Colusa Northern California; Vicinity of Colusa 0 Comment
  CDA32033  Ambrosia psilostachya D. Isle, Rhonda Isle 2007-9-9 1624 Colusa Mendocino National Forest- North Coast Ranges Middle Fork Stony Creek Watershed; Stonyford Park at NW edge of Indian VA Elementary School; about 100 yds SE of Co. Rd 306 Stony Creek Bridge; about 1/4 mile S of Glenn Co. line. 0 Comment
  CHSC61395  Ambrosia psilostachya Vernon H. Oswald; Joseph Silveira 1993-8-16 5804 Colusa Refuge located ca. 7 mi S of Willows, center N side of Tract 44, near the S boundary of the refuge. 24 Comment
  CHSC94748  Ambrosia psilostachya Lowell Ahart 2006-9-26 13350 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  JEPS89498  Ambrosia psilostachya Dean W. Taylor 1989-8-6 10510 Colusa s.w. margin Delevan Nat'l Wildlife Refuge; Sacramento Valley, Delevan Nat'l Wildlife Refuge Comment
  POM50992  Ambrosia psilostachya Roxana Stinchfield 1916-7-8 376 Colusa Truck garden Stinchfield Ranch - Sycamore Slough. Comment
  RSA718532  Ambrosia psilostachya L. Ahart 2006-10-31 13518 Colusa 20 yards northeast of the bridge across Stony creek, just north of Stonyford. 348 Comment
  CDA20509  Ambrosia psilostachya D. Isle 2004-11-17 DI 2 -04 Colusa Northwestern California; Just N of Stony Creek, N of Stonyford and S of the Glenn county line. 344 Comment
  JEPS80058  Amelanchier utahensis L. R. Heckard with J. Hickman 1979-6-15 5058 Colusa n of West Peak, Snow Mt. (along e trail from Frog Camp to Saddle, Snow Mt); Snow Mt. 2072 Comment
  CHSC84957  Ammannia coccinea Lowell Ahart 2003-10-23 10673 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  UC1191561  Ammannia coccinea Herbert L. Mason 1945-9-19 12716 Colusa 1 mi. above Colusa (below causeway over Butte Sink spillway, e. bank Sacramento R.); Butte Sink, Sacramento R. Comment
  POM134394  Ammannia robusta Roxana Stinchfield 1916-7-17 288 Colusa At Tule Levee, College City Comment
  CHSC25321  Ammi visnaga Hayes; Warner, Schlising 1977-8-23 48 Colusa Along River Rd. on the east side of the Sacramento River, 3.5 mi n Of Colusa. 50 Comment
  UCD127170  Ammi visnaga V. C. Bryant 1929-9-1 s.n. Colusa location unknown. Comment
  CAS-BOT-BC213951  Amsinckia Roxana S. Ferris 1926-4-23 6414 Colusa At mountain house on the Williams-Stonyford Road Comment
  POM287422  Amsinckia intermedia Lyman Benson 1935-3-27 6331 Colusa 6 miles west of Williams. 213 Comment
  SEINET12519076  Amsinckia intermedia Christine Laning 1973-1 108 -14 Colusa 10.0 miles northwest of Rumsey on Route 16, near Yolo/Colusa county line. Comment
  CHSC81225  Amsinckia lunaris L. P. Janeway; B. Castro 2001-4-18 7024 Colusa Vicinity of Grapevine Creek, Sites-Lodoga Road, and Scotties Spring. 274 Comment
  UCD77237  Amsinckia lunaris Robert E. Preston 2005-4-10 2330 Colusa Ca. 0.9 mi ESE of Wilbur Springs, along Bear Valley Road. 373 Comment
  RSA0089732  Amsinckia lunaris B. Castro 2003-3-18 1384 -a Colusa Vicinity of Sites (Offstream Storage Investigation: Sites S. Bridge road route), hills N of the Sites-Lodoga Road, and Stone Corral Creek. 198 Comment
  CHSC37413  Amsinckia lycopsoides R. A. Schlising; K. R. Stern 1980-5-5 3583 Colusa Colusa National Wildlife Refuge; southwest of Colusa; southwest corner of refuge, north of Ware Road. Comment
  CHSC86528  Amsinckia lycopsoides B. Castro 2003-3-18 1386 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 265 Comment
  UC1084529  Amsinckia lycopsoides Peter Kamb 1952-5-25 2291 Colusa 1 mi e Lake County line (on Hwy 20) Comment
  UC1093625  Amsinckia lycopsoides Francia Chisaki, Gene B. Newcomb 1958-4-1 1096 Colusa on road to Lodoga and Wilbur Springs (0.5 mi nw of junction with Hwy 20) Comment
  HSC94205  Amsinckia menziesii D. Haskamp, E. Sonnenblick, M. Taft 1995-4-1 13 Colusa On Bear Valley Rd., 1.2 mi. S of the junction with Brim Rd. 415 Comment
  UC78236  Amsinckia tessellata var. gloriosa K. Brandegee May 1884 Colusa Mountain House; North Coast Ranges Comment
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Jun 20 2007
  CAS-BOT-BC45252  Ancistrocarphus filagineus Lewis S. Rose 1936-4-27 36187 Colusa 15 miles NW of Rumsey 304 Comment
  CHSC79443  Ancistrocarphus filagineus B. Castro; L. P. Janeway 2000-5-3 1122 Colusa Vicinity of Sites, Huffmaster Rd, Antelope and Grapevine Creeks, just N of the divide between the two creeks. 414 Comment
  JEPS120971  Ancistrocarphus filagineus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18626 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UC1111603  Ancistrocarphus filagineus Herbert L. Mason 1941-4-5 12406 Colusa 3 mi s Stonyford Comment
  UCD162976  Ancistrocarphus filagineus Jack Major 1963-5-4 s.n. Colusa Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 396 Comment
  UCD163684  Ancistrocarphus filagineus Craig Thomsen 1999-4-15 1985 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCD166309  Ancistrocarphus filagineus Jack Major 1962-4-28 805 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  HSC47645  Ancistrocarphus filagineus J. P. Smith, J. O. Sawyer 1978-4-29 9791 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  JEPS75850  Anisocarpus scabridus L. R. Heckard 1974-9-10 3900 Colusa se slope East Peak Snow Mt. 2103 Comment
  CAS-BOT-BC84714  Anthemis cotula Roxana Stinchfield 1916-6-15 275 Colusa College City Comment
  UC29539  Anthemis cotula J. Burtt Davy 1898-5-1 4280 Colusa Willows Comment
  UCD164161  Anthriscus caucalis Craig Thomsen 2000-4-28 2269 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  CAS-BOT-BC237912  Antirrhinum subcordatum Rattan 1940-6-7 s.n. Colusa On the ridge east of Lodogo. On Stony Creek, not far from this station Comment
  CHSC94883  Antirrhinum subcordatum Lowell Ahart 2006-6-11 12673 Colusa On the west side of an off road trail (Trail 30), about 50 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  JEPS108810  Antirrhinum subcordatum Lowell Ahart 2006-6-11 12673 Colusa On the west side of an off road trail (Trail 30), about 50 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  UC726114  Antirrhinum subcordatum A. A. Heller 1940-6-7 15717 Colusa ridge e Lodogo Comment
  UCD70221  Antirrhinum vexillocalyculatum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  RSA161328  Antirrhinum vexillocalyculatum subsp. breweri Peter H. Raven, Richard Snow 1959-9-11 14420 Colusa Openings in forest of Pinus ponderosa, Dark Hollow Creek. 1860 Comment
  JEPS104394  Antirrhinum vexillocalyculatum subsp. intermedium Lowell Ahart 2003-7-14 10388 Colusa By a wash, on the e side of Bear Valley Rd, ca 3 mi nw of Highway 20. 381 Comment
  JEPS108788  Antirrhinum virga Lowell Ahart 2006-6-15 12792 Colusa On the west side of Forest Road 18N03, about 100 yards north of Mill Creek, near Fouts, Mill Creek Campgrounds, about 5 3/4 miles (air) west-southwest of Stonyford 500 Comment
  RSA724838  Antirrhinum virga L. Ahart 2006-6-15 12792 Colusa On the west side of Forest Road 18N03, about 100 yards north of Mill Creek, near Fouts, Mill Creek Campgrounds, about 5 3/4 miles (air) west-southwest of Stonyford. 500 Comment
  UCR281731  Antirrhinum virga David Isle 2015-6-20 2157 Colusa North Coast Range, c. 4 miles west of Stonyford, southeast of curve at culvert crossing just east of old dumpsite road junciton, uphill c. 200 ft south of 18N01 439 Comment
  CHSC79556  Aphanes occidentalis B. Castro; L. P. Janeway 2000-5-4 1127 A Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 246 Comment
  CHSC91007  Aphanes occidentalis D. Isle 2002-4-18 299 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. N of Chlorinator bldg., Rd. to Bath House Trail. 548 Comment
  JEPS87723  Apiastrum angustifolium Vernon H. Oswald and Lowell Ahart 1994-3-23 6017 Colusa just w of bridge over Sullivan Creek (s of Stonyford, Goat Mountain Road); Goat Mountain Road 505 Comment
  UC1051713  Apocynum cannabinum Helen K. Sharsmith 1953-6-19 4263 Colusa near confluence of N. and Middle forks of Stoney Creek Red Bridge Camp; Inner North Coast Ranges, Mendocino Nat'l Forest, Red Bridge 548 Comment
  UCD66955  Apocynum cannabinum Ellen Dean; Davis Botanical Society 2008-5-31 4999 Colusa west of I-5 at Maxwell, along Goat Mountain Road following Little Stoney Creek, Little Stoney Creek Canyon. 414 Comment
  UCD64028  Aquilegia eximia Craig D. Thomsen 2000-5-11 2280 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  UCD23339  Aquilegia eximia A. M. Shapiro 2003-8-19 s.n. Colusa Little Stony Creek. Partly shaded serpentine riparian habitat. 475 Comment
  UCD66930  Arceuthobium campylopodum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5079 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. In western part of ranch, several hundred feet downslope of ridge trail. Along trail that starts along ridge bordering Thompson Creek headwaters and loops back to ridge trail. Large, dammed stock pond, holding water still, in middle of meadow. Comment
  UCR225254B  Arceuthobium occidentale Ellen Dean, Gordon Harrington, J. Anderson, E. Bayon, R. Willmarth 2008-6-8 5079 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch, several hundred feet downslope of ridge trail, along trail that starts along ridge bordering Thompson Creek headwaters and loops back to ridge trail Comment
  CHSC83138  Arctostaphylos G. L. Webster 1989-5-6 7700 Colusa Near border with Lake Co., on crest of Walker Ridge, near Cold Springs Mt. Comment
  CAS-BOT-BC25251  Arctostaphylos canescens subsp. canescens Josh Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 36 Colusa Walker Ridge Rd., 4.8 miles N of junction with Indian Valley Access Rd. 975 Comment
  HSC96816  Arctostaphylos canescens subsp. canescens J. Carey, A. Hong, J. Leffingwell 1995-4-1 24 Colusa Walker Ridge Rd., 4.8 mi. N of its junction with Indian Valley Access Rd. 976 Comment
  UCD67040  Arctostaphylos canescens subsp. canescens Ellen Dean; Davis Botanical Society 2008-5-31 5020 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCD66956  Arctostaphylos canescens subsp. sonomensis Ellen Dean; Davis Botanical Society 2008-5-31 5000 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 822 Comment
  UCD51019  Arctostaphylos glandulosa G. L. Webster 1989-5-6 7697 Colusa Near Border with Lake County; on Walker Ridge; near Cold Spring Mountain. Comment
  UCD66998  Arctostaphylos glandulosa Craig D. Thomsen; Gordon Harrington 2008-7-6 2781 -b Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat, along ridge trail above Cache Creek Canyon. 640 Comment
  CAS-BOT-BC38981  Arctostaphylos malloryi P. C. Everett; E. K. Balls 1954-10-17 20335 Colusa 2 mi. SW of Trough Springs on road to Upper Lake from Stonyford Comment
  CDA16131  Arctostaphylos manzanita G. F. Hrusa 1999-2-13 14915 Colusa North Coast Ranges; along Little Stony Creek, on road to Cedar Camp and Goat Mtn. 0 Comment
  HSC67141  Arctostaphylos manzanita J. P. Smith, Thomas W. Nelson 1976-4-14 8587 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  UC1388337  Arctostaphylos manzanita subsp. elegans Freed W. Hoffman 1948-6-28 2439 Colusa road between Upper Letts Valley and Lower Letts Valley (w Colusa Co.); North Coast Ranges 1219 Comment
  RSA0010486  Arctostaphylos manzanita subsp. roofii Richard R. Halse 2014-3-25 9034 Colusa Along the Bear Valley Road ca.1.8 miles west northwest of its junction with State Hwy.20. 378 Comment
  JEPS80051  Arctostaphylos nevadensis L. R. Heckard with J. Hickman 1979-6-15 5051 Colusa east trail from Frog Pond to cirque of east and west peaks (ne slope of West Peak ridge); Snow Mt. 1981 Comment
  UCD82129  Argemone munita Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5659 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  CDA24525  Argemone munita subsp. rotundata R. Lawley 1960-5-22 Colusa Stonyford. 0 Comment
  CHSC87131  Aristida ternipes var. hamulosa B. Castro; Michelle Cedarborg 2003-5-6 1427 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  POM165698  Aristolochia californica Roxana S. Ferris 1917-4-15 s.n. Colusa Sycamore Slough Comment
  UC1950728  Aristolochia californica R. Schmid 2000-3-21 2010 -6 Colusa Cache Valley, on west side of HW 16, a few km north of county line Comment
  CDA15478  Arnica discoidea G. F. Hrusa, WTD 1998-6-19 14615 Colusa North Coast Ranges; USFS Pacific Ridge Rd. (M5), +- 4-5 km. NW of inters. w/Colusa Co. Goat Mtn. Rd. Comment
  JEPS15569  Arnica longifolia G. Thomas Robbins with L. R. Heckard 1956-7-25 3712 Colusa Snow Mt. East (s flank) Dark Hollow Creek, Snow Mt. East 1981 Comment
  JEPS75860  Arnica longifolia L. R. Heckard 1974-9-10 3889 Colusa Dark Hollow Creek Snow Mt., Dark Hollow Creek 2011 Comment
  CAS-BOT-BC82672  Arnica longifolia G. Thomas Robbins; L. R. Heckard 1956-7-25 3712 Colusa Along edge of Dark Hollow Creek (a tributary of Middle Fork Stony Creek), on southern flank of Snow Mt. East, 2011 Comment
  CAS-BOT-BC90262  Artemisia douglasiana J. H. Thomas 1960-8-30 8862 Colusa About 2.4 miles NW of Sycamore on road to Colusa Comment
  CHSC84932  Artemisia douglasiana Lowell Ahart 2003-10-23 10660 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  SFV10912  Asclepias cordifolia M. L. Vincent 1968-6-6 791 Colusa 1.2 miles west from Stony Ford. 11 mile sign on trip down from Goat Mountain. 375 Comment
  HSC87000  Asclepias cordifolia Brent Helm, Curtis Miller, Mark Steiger 1988-4-16 73 Colusa 3.7 mi. W on Goat Mtn. Rd., off of Lodoga-Stonyford Rd. 452 Comment
  UCD84440  Asclepias eriocarpa Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6050 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  UCR270712  Asclepias solanoana John F. Emmel 2002-7-30 1775 Colusa North Coast Range, Summit Springs area, south of Snow Mountain, 0.3-0.4 air mile NE of Summit Spring 1616 Comment
  JEPS95651  Asclepias speciosa Vernon H. Oswald and L. Ahart 1999-6-18 9774 Colusa Fouts Springs Rd. (M10) 9.9 mi west of Stonyford-Elk Creek Rd.: T17N R7W Sect. 7, 2050 ft, chaparral, serpentine substrate. From a colony growing along the edge of a roadside seep. 624 Comment
  UCD164137  Asclepias speciosa Craig Thomsen 2000-6-12 2364 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  JEPS73499  Aspidotis densa L. R. Heckard 1972-7-10 3117 Colusa trail e of Foutch Camp Snow Mt (near Trout Creek) 1828 Comment
  JEPS95275  Aspidotis densa Vernon H. Oswald and Lowell Ahart 1994-3-23 6014 Colusa S of Stonyford (Frenzel Creek Research Natural Area, S side of Litte Stony Creek, in the section on the E side of creek) 518 Comment
  RSA724830  Aster subulatus var. ligulatus L. Ahart 2006-9-26 13343 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  CAS-BOT-BC478060  Asteraceae Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5035 Colusa Southern Northern Inner Coast Ranges, Snow Mountain, Summit Spring Trail, 1.4 km W of Snow Mtn West summit, 800 m N of Cedar Camp 1988 Comment
  SEINET3142827  Astragalus clevelandii Unknown 1985-6-19 sn Colusa Just SW of Bear Valley, on ridge NW of Wilbur Hot Spring ca 2 air mi. Comment
  UCD58179  Astragalus clevelandii Gordon Harrington 2007-5-31 69 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  UCD64032  Astragalus clevelandii Craig D. Thomsen 2000-6-23 2411 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  HSC72171  Astragalus gambelianus Thomas W. Nelson, Jane P. Nelson 1978-4-2 9548 Colusa Bear Valley Rd., 1.3 mi. from its junction with Hwy. 20 366 Comment
  JEPS120976  Astragalus gambelianus Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18633 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  SEINET4208041  Astragalus gambelianus Richard R. Halse 2013-3-27 8765 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of the junction of State Hwys. 20 and 53.; 0 558 Comment
  UCD163330  Astragalus gambelianus Craig D. Thomsen 2009-5-3 2799 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.5 miles north of Hwy 20. Comment
  HSC47646  Astragalus gambelianus J. P. Smith, J. O. Sawyer 1978-4-29 9790 Colusa Just W of Walker Ridge Rd. intersection with Bartlett Springs Rd. Comment
  UCD104819  Astragalus gambelianus J. M. Tucker 1958-3-7 3363 Colusa State Highway 16, Cache Creek Canyon, 0.1 mile north of Yolo-Colusa County line. Comment
  CAS-BOT-BC193115  Astragalus rattanii var. jepsonianus Alice Eastwood; John Thomas Howell 1938-5-16 5634 Colusa Lake - Colusa Co. line on road to Williams Comment
  CHSC29256  Astragalus rattanii var. jepsonianus John Steiner 1977-4-16 46 Colusa Growing in an open field, ca. 0.5 km w of jct. of Hwys 20 and 16, s side of Bear Creek, ca. 30 km sw of Williams. 322 Comment
  HSC44108  Astragalus rattanii var. jepsonianus Barbara Kelly 1977-4-24 390 Colusa Along Walker Ridge Rd. above Barrel Springs Campground. 701 Comment
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Jul 31 2014
  UCD15422  Astragalus rattanii var. jepsonianus Margit Sands 1985-4-13 25 Colusa in Bear Valley, 3.8 miles north of Wilbur Hot Springs rd.; 390 Comment
  UCD56661  Astragalus rattanii var. jepsonianus Sam Bledsoe 2007-3-25 3 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD63037  Astragalus rattanii var. jepsonianus Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Along unnamed tributary of Bear Creek. 322 Comment
  UCD81236  Astragalus rattanii var. jepsonianus Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5400 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Edge of Bear Creek, near mouth of canyon located to the south of Brophy Canyon. 224 Comment
  UCR212305  Astragalus rattanii var. jepsonianus Craig D. Thomsen 2000-5-11 2291 B Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  SEINET4673879  Athysanus pusillus Richard R. Halse 2013-3-27 8763 Colusa Along State Hwy. 20 just east of the Colusa/Lake County Line, ca. 14.6 miles east of the junction of State Hwys. 20 and 53.; 0 558 Comment
  SEINET11991668  Athysanus pusillus E. J. Baker 1984-1 18 Colusa ca 0.3 mi W of jct of Hwy 20 & 16, S side of Bear Creek, ca 18 mi SW of Williams 322 Comment
  UCD66944  Atriplex Craig D. Thomsen 2000-5-11 2289 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. 304 Comment
  UCR205145  Atriplex argentea George K. Helmkamp, E. A. Helmkamp 2008-10-14 14250 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  CHSC61039  Atriplex depressa Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5703 Colusa Colusa National Wildlife Refuge. W side of Pool 3 on the S end of the refuge near Ohm Rd., ca. 2 mi N of Ware Rd., ca. 5 mi S of Colusa. 15 Comment
  JEPS90596  Atriplex depressa Dean W. Taylor 1993-8-31 14069 Colusa dry vernal pool ca 200 mi e North Fork Logan Creek (Logandale 7 1/2' USGS quadrangle); Sacramento Valley, Sacramento National Wildlife Refuge 24 Comment
  CHSC107934  Atriplex fruticulosa B. Castro; L. Janeway 2011-7-9 1895 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. In swale about 300 ft north of large +- alkaline marsh. At edge of swale near star-thistle thicket. 49 Comment
  CHSC80184  Atriplex joaquinana B. Castro; G. Kuenster 2000-7-19 1210 Colusa Vicinity of Maxwell, Funks Creek, and the Glenn-Colusa canal, on low terrace beside S edge of shallow ephmeral stream channel draining eastward out of the hills east of Golden Gate. 54 Comment
  JEPS108753  Atriplex prostrata Lowell Ahart 2006-9-26 13347 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  UCD163663  Atriplex prostrata Craig Thomsen 1998-6-10 1961 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CAS-BOT-BC146205  Avena barbata Roxana S. Ferris 1917-4-14 591 Colusa Arbuckle - Rumsey Road. 3 miles west of Arbuckle. Comment
  SEINET3919631  Avena barbata J. P. Smith, Thomas Nelson; Jane P. Nelson 1978-4-2 9559 Colusa Bear Valley Road, 2.1 miles from its junction with State Route 20.; 0 366 Comment
  SEINET3919645  Avena barbata Patricia Shesgreen 1978-4-22 33 Colusa Wilbur Springs Quad. Bear Valley Road, 1.5 miles from its junction with State Route 20.; 0 411 Comment
  HSC66008  Avena fatua Teri Bartowski, Shane Feusier, Ruth Takaki, Carol Zimmerer 1980-4-19 43 Colusa 5.4 miles from Lodoga, along Little Stony Creek at Digger Pine Campground Comment
  UCD57660  Avena fatua Hildegarde Durkin; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. North side of Thompson Creek. Side of trail. 373 Comment
  UCD66443  Avena fatua Craig D. Thomsen 2000-4-28 2212 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCR225656  Avena fatua Craig D. Thomsen 2008-4-27 s.n. Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and west northwest of Cowboy Camp on the west side of Bear Creek 452 Comment
  JEPS113773  Azolla filiculoides Lowell Ahart 2007-7-7 14260 Colusa On north side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley 20 Comment
  RSA726847  Azolla filiculoides Lowell A. Ahart 2007-7-7 14260 Colusa About 1.25 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  UCD66921  Baccharis pilularis Craig D. Thomsen; G. Harrington 2008-7-6 2778 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek canyon. Along ridge trail. 510 Comment
  CAS-BOT-BC100066  Balsamorhiza macrolepis James Jokerst 1985-4-5 2210 Colusa Wilbur Springs Quad. Near Coyote Peak 456 Comment
  UCD163323  Balsamorhiza macrolepis Craig D. Thomsen 1997-4-20 1922 Colusa Bear Valley. About 6 miles north of Hwy 20. Comment
  CHSC70963  Balsamorhiza macrolepis var. macrolepis Vernon Oswald; Lowell Ahart 1998-5-7 9010 Colusa Bartlett Springs Rd. 2.8 mi west of Bear Valley Rd., 0.1 mi east of Sawtelle Valley and Grapevine Flat road. 633 Comment
  CHSC61040  Bassia hyssopifolia Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5699 Colusa Colusa National Wildlife Refuge. SE corner of Tract 21 on the S side of the refuge near Ohm Rd., ca. 1 mi N of Ware Rd., ca. 6 mi S of Colusa. 15 Comment
  UCD97545  Bassia hyssopifolia Beecher Crampton 1963-8-3 6868 Colusa 1/4 mile east of Cortena. Comment
  UCD97576  Bassia hyssopifolia Herbert L. Mason 1946-8-6 12958 Colusa On Colusa-Marysville Highway, four miles south of Colusa, west side of Sacramento River. Comment
  JEPS104404  Bergia texana Lowell Ahart 2003-10-23 10670 Colusa On the e strand of East Park Reservoir, ca 1/8 mi nw of Sites Lodoga Rd, ca 1 mi n of Lodoga, ca 21 mi w of Maxwell. 368 Comment
  JEPS18813  Blennosperma nanum var. nanum Ruth Johnson 1915-4-6 Colusa College City Comment
  JEPS73482  Boechera breweri subsp. breweri L. R. Heckard 1972-7-9 3093 Colusa se slope East Peak; Snow Mt. 2072 Comment
  JEPS73511  Boechera breweri subsp. breweri L. R. Heckard 1972-7-10 3129 Colusa 3 mi nw Fouts Springs (se corner of Snow Mt.); Snow Mt. 1828 Comment
  JEPS15272  Boechera breweri subsp. shastaensis Rimo Bacigalupi G. L. Stebbins and Peter Kamb 1950-4-16 3106 Colusa ridge n Red Bridge Camp (between and above the confluence of the N and Middle Forks of Stony Creek, nw Colusa Co., very close to Glenn Co. line); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  JEPS127623  Boehmeria cylindrica B. Castro with Tom Boullion 2009-8-24 1800 G-1 Colusa Ca 8 ai mi SE of Colusa, via Buster Rd off Hwy 45, just W of Ogden Bend on W bank of the Sacramento River at RM 130.8. Comment
  RSA724954  Boisduvalia densiflora var. densiflora L. Ahart 2006-8-9 13140 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  POM262502  Boisduvalia densiflora var. densiflora Milo S. Baker 1941-7-8 10114 Colusa Colusa County: roadside ditch Bear Valley in adobe, S of Lodoga Comment
  SEINET8354595  Bolboschoenus fluviatilis David B. Marshall 1954-7-20 Colusa Colusa National Wildlife Refuge. Comment
  CHSC84931  Bolboschoenus glaucus Lowell Ahart 2003-10-23 10672 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  CAS-BOT-BC28201  Bolboschoenus glaucus Maxine Wilkes 1929-8-1 s.n. Colusa Unspecified Comment
  CAS-BOT-BC75490  Bolboschoenus glaucus B. Crampton 1953-4-29 1150 Colusa 4 miles east of Norman. Comment
  UCD18527  Bolboschoenus glaucus June McCaskill; with Mr. Harvey and Loren Davis 1954-8-9 361 Colusa ca. 2 mi. east of Princeton and 400 yds. south of Glenn County line. Comment
  CAS-BOT-BC31371  Bolboschoenus maritimus Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-11 467 Colusa Davis tule, near Sycamore Slough Comment
  CHSC107176  Bolboschoenus maritimus subsp. paludosus L. P. Janeway; B. Castro 2011-5-19 10287 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. In 0-6 cm of standing water where overgrown dirt roadbed passed through the marsh. 49 Comment
  UCD140026  Bolboschoenus maritimus subsp. paludosus P. B. Kennedy 30-31 May 1922 s.n. Colusa Near Cortina. Comment
  UCR206291  Brassica juncea George K. Helmkamp, E. A. Helmkamp 2009-5-20 14737 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  IRVC29685  Brickellia grandiflora Mark A. Elvin, Mark S. Brunell, David Isle 2006-8-3 5033 Colusa Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. Southern Northern Inner Coast Ranges 1989 Comment
  CAS-BOT-BC127866  Brickellia greenei Mark A. Elvin; Mark S. Brunell; David Isle 2006-8-3 5034 Colusa Southern Northern Inner Coast Ranges: Snow Mtn; Summit Spring Trail; 1.4km W of Snow Mtn West summit; 800m N of Cedar Camp. 1989 Comment
  SEINET7075565  Brodiaea elegans A. G. Vestal 1955-4-5 3684 Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  CHSC89838  Brodiaea elegans subsp. elegans B. Castro; L. Janeway 2001-5-10 1248 A Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek, just down from the blue oak-grassland edge. 396 Comment
  JEPS81271  Brodiaea elegans subsp. elegans L. R. Heckard and J. C. Hickman 1982-7-5 5879 Colusa slope below (s of) area Summit Springs (s side of Snow Mountain); s side Snow Mountain 1500 Comment
  UC1051716  Brodiaea elegans subsp. elegans Helen K. Sharsmith 1953-6-19 4268 Colusa near confluence of North and Middle Forks of Stoney Creek; Inner North Coast Ranges, Mendocino National Forest, Red Bri 548 Comment
  UCD72482  Brodiaea elegans subsp. elegans Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3816 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, along trail that beings approximately across from BLM parking lot, located at south end of bridge. 256 Comment
  CAS-BOT-BC149477  Bromus carinatus var. carinatus F. P. Cronemiller 1924-5-12 877 Colusa Below Lower Letts Valley. 1219 Comment
  UCD59156  Bromus carinatus var. marginatus Beecher Crampton 1958-5-19 4800 Colusa 5.8 miles south of Lodoga. Comment
  HSC100292  Bromus diandrus J. P. Smith 2011-4-27 13144 Colusa Along Hwy. 16, 1.3 mi. S of junction with Hwy. 20 315 Comment
  RSA163468  Bromus diandrus Roxana S. Ferris 1926-4-21 6217 Colusa On Sycamore slough, 2 miles from Sycamore Comment
  JEPS75408  Bromus hordeaceus W. L. Jepson 1932-5-8 16289 Colusa Stonyford 365 Comment
  UCD37832  Bromus hordeaceus Beecher Crampton 1962-4-17 6222 Colusa 3.3 miles north of College City. Comment
  HSC31698  Bromus laevipes Thomas E. Higley 1974-5-4 63 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  JEPS80797  Bromus laevipes L. R. Heckard and J. C. Hickman 1981-7-30 5767 Colusa se side of Snow Mountain, along Trout Creek Trout Creek; Snow Mountain, Trout Creek 1554 Comment
  UCD72529  Bromus laevipes Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3820 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek along trail that begins approximately opposite the BLM parking lot near south end of bridge. Approx. 0.75 mile along trail. 286 Comment
  CHSC112028  Bromus laevipes David Isle; Doug Johnson 1988-5-11 2089 Colusa Mendocino National Forest. Little Stony Road (Goat Mtn Rd). 426 Comment
  CHSC86613  Bromus madritensis subsp. rubens Jenny Marr; Heidi West, Joyce Lacey, Caroline Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. 121 Comment
  UC1543159  Bromus madritensis subsp. rubens Charlotte G. Nast 1936-4-17 135 Colusa Williams to Lake County Road Lake County Road Comment
  SEINET4404370  Bromus rubens R. R. Halse 2002-3-21 6130 Colusa Williams; by junction on 5th Street and B Street; 24 Comment
  UCD59764  Bromus tectorum Beecher Crampton 1958-5-19 4808 Colusa West of Lodoga. Comment
  UCD129652  Cacaliopsis nardosmia J. M. Tucker 1959-5-30 3519 Colusa Trough Spring, at northeast end of Trough Spring Ridge, ca. 5.75 miles (airline) southwest of Stonyford. 975 Comment
  SBBG128801  Calandrinia breweri L. Ahart 2013-5-1 18673 Colusa N sie of St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  RSA783301  Calandrinia ciliata R. R. Halse 2010-3-20 7825 Colusa Along State Hwy 45 ca. 10 miles N of Colusa (junction of State Hwys 45 & 20). 22 Comment
  UCD57308  Calandrinia ciliata Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3679 Colusa BLM Payne Ranch. Lands to the southwest of junction of Hwy. 20 and Hwy. 16. Thompson Canyon, near juncture with Craig Canyon. 362 Comment
  UCD64251  Calandrinia ciliata Craig D. Thomsen 2000-3-31 2053 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC72115  Calandrinia ciliata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9530 Colusa Bear Valley Rd., 5 mi. from its junction with Hwy. 20 390 Comment
  UCD100193  Calandrinia ciliata Mark Hershkovitz 1991-5-3 s.n. Colusa Walker Ridge, along Walker Ridge Rd. nr. Turn-off to Bear Valley on north end; serpentine site. Comment
  CHSC86517  California macrophylla B. Castro; Beth Hendrickson 2003-3-24 1398 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. On and along dirt road. 289 Comment
  UCD57052  California macrophylla Gordon Harrington; Diana Hickson 2007-4-7 0011 Colusa BLM Payne Ranch, SW of intersection of Hwy 16 and Hwy 20, 3/4 mile west of Roadkill Cafe. Comment
  HSC48142  Calochortus amabilis Thomas W. Nelson, Jane P. Nelson 1978-4-30 3970 Colusa Along SR 20 just E of Colusa-Lake County line 549 Comment
  CHSC85971  Calochortus luteus Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  JEPS122381  Calochortus luteus Nisrine Machaka-Houri with Gracie Benson-Martin 2014-5-3 NG 1 Colusa Bear Valley Road Comment
  UCD82117  Calochortus luteus Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5645 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UC1299346  Calochortus luteus Freed W. Hoffman 1948-5-10 3168 Colusa Williams-Bartlett Mt road, extreme w part of Colusa County Comment
  CHSC80106  Calochortus splendens L. P. Janeway; Joyce Lacey-Rickert 2000-6-1 6779 Colusa Vicinity of Grapevine Creek, Scotties Canyon, and Rena Canyon. 243 Comment
  UC1562598  Calochortus splendens Barbara Ertter 1989-7-1 8600 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd), at head of South Fork Stony Creek, s.w. side of ridge); South Fork Stony Creek 1500 Comment
  UCD146722  Calochortus splendens G. F. Hrusa 1998-6-19 14612 Colusa above upper Little Stony Creek. Goat Mountain Road around 1.5 km west of campground. 485 Comment
  JEPS15268  Calochortus uniflorus Rimo Bacigalupi with G. T. Robbins, S. Galen Smith, and Peter Kamb 1950-4-16 3126 Colusa along Bear Creek, along road following the length of Bear Valley, at about its middle, close to BM 1326 ft, w-most Colusa County Bear Valley, Bear Creek Comment
  UCD139597  Calochortus uniflorus Clinton C. Shock 1980-5-3 59 Colusa Bear Valley, about 12 miles northwest of State Highway 20. 384 Comment
  CAS-BOT-BC270757  Calycadenia pauciflora Volney Rattan 1884-6-1 s.n. Colusa Stony Creek Comment
  HSC94037  Calycadenia pauciflora G. Fred Hrusa 1998-6-19 14595 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  JEPS120714  Calycadenia pauciflora Lowell Ahart 2013-10-1 19069 Colusa Near a small drainage, north of the wash and State Highway 20, just east of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles west of Williams. Comment
  RSA0118882  Calycadenia pauciflora Lowell Ahart 2013-10-1 19069 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  RSA255514  Calycadenia pauciflora Gerald D. Carr 1971-9-15 658 Colusa 6 miles north of Yolo County Line on Hwy. 16 Comment
  RSA255526  Calycadenia pauciflora Gerald D. Carr 1971-9-14 651 Colusa 2 miles southwest of Leesville on road to Bartlett Springs Comment
  RSA255611  Calycadenia pauciflora Gerald D. Carr 1971-7-29 608 Colusa 1 mile south of Stoneyford on road to Lodoga 366 Comment
  RSA255612  Calycadenia pauciflora Gerald D. Carr 1971-7-29 606 Colusa On road to Trout Creek Trail, 0.5 miles NW of driveway to Fout Spr. Boy's Ranch 503 Comment
  RSA788193  Calycadenia pauciflora R. L. Carr 1978-8-20 2152 Colusa Colusa-Lake Co line on Hwy 20. Comment
  SEINET10798196  Calycadenia pauciflora Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 383 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  UC1876243  Calycadenia pauciflora Gerald D. Carr 1972-7-29 720 Colusa 0.3 mi E of Lake Co. line on Bartlett Springs Rd. Comment
  UC1876635  Calycadenia pauciflora Gerald D. Carr 1971-9-14 652 Colusa 3.6 mi SW of Leesville on road to Bartlett Spr. Rd. 518 Comment
  UC1971709  Calycadenia pauciflora 1978-8-20 2152 Colusa Colusa-Lake Co. line on Hwy 20, E of Clearlake Oaks (=GDC 703) 570 Comment
  UC1971710  Calycadenia pauciflora 1978-8-20 2155 Colusa Brim Road (to Bartlett Springs), 1.5 mi W of jct with Bear Valley Road, ca. 3.6 mi SW of Leesville (=GDC 652) 482 Comment
  UCD129835  Calycadenia pauciflora Gerald D. Carr 1972-7-29 717 Colusa 8.7 miles north of Highway 20 on Bear Valley Road, Bear Creek. Comment
  UCD129837  Calycadenia pauciflora Gerald D. Carr 1972-7-29 720 Colusa 0.3 mile east of Lake County line on Bartlett Springs Road. Comment
  UC1543009  Calycanthus occidentalis Donald G. Nelson et. al. 1940-6-9 694 Colusa Happy Creek Camp Stony Creek, Paradise Creek (on Paradise Creek, which empties into middle fork of Stony Creek, nw corner of Colusa County) 731 Comment
  UCD63711  Calycanthus occidentalis Craig D. Thomsen 2008-3-20 2713 Colusa BLM Payne Ranch. South of Hwy 20, 0.5 mile south of intersection of Hwy 16 and Hwy 20 (Colusa Co. milepost 2.63). Approximately 200 meters upstream from where UTM data point was taken. 500 Comment
  UCD82572  Calycanthus occidentalis Craig Thomsen 2008-6-12 2763 Colusa Walker Ridge, Elgin Mine area. Comment
  UC1731405  Calyptridium quadripetalum Dean W. Taylor 1998-6-23 16713 A Colusa ca. 1 mi. s.e. Baldy Mt. (stock pond at head Doyle Canyon); N. coast Range Region (NCoRI), Walker Ridge, Doyle Canyon 853 Comment
  CDA39872  Calystegia collina T. C. Fuller 1958-5-27 3670 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  UCD163873  Calystegia collina subsp. collina Craig D. Thomsen 2000-5-11 2307 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 1.5 mile west of Hwy 20/16 instersection. Comment
  UCD63111  Calystegia collina subsp. collina Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4942 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 384 Comment
  CHSC70976  Calystegia collina subsp. oxyphylla Vernon Oswald; Lowell Ahart 1998-5-7 9000 Colusa Barlett Springs Rod. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  JEPS94202  Calystegia collina subsp. oxyphylla Vernon Oswald and Lowell Ahart 1998-5-7 9000 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UCD164158  Calystegia subacaulis Craig Thomsen 2000-4-28 2266 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  CHSC100287  Camassia quamash David Isle 1990-6-6 1517 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. East end Upper Summit Valley 'lake' edge, MDMB (South of Road 17N10). 1694 Comment
  UC1614405  Camissonia Charles M. Belshaw 1937-4-25 2831 Colusa Inner North Coast Range, Cooks Springs, Devils Ridge Devils Ridge; Inner North Coast Range, Cooks Springs, Devils Ridge Comment
  CHSC79775  Camissonia contorta L. P. Janeway; B. Castro 2000-5-4 6704 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 262 Comment
  HSC45719  Camissonia contorta Sheila Logan 1978-4-22 27 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  POM271975  Camissonia graciliflora Lyman Benson 1935-3-27 6328 Colusa 8 miles E of Lake County line, inner N coast mt. range, Sacramento River watershed 305 Comment
  UCD37191  Camissoniopsis hirtella Beecher Crampton 1958-5-19 4807 Colusa 4-8 miles south of Lodoga, Little Stony Creek Canyon. Comment
  JEPS120912  Campanula angustiflora Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18653 Colusa Rocky serpentine outcrop on the N side of Hwy 20, just E of the Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams Comment
  CHSC112316  Campanula griffinii Lowell Ahart 2013-5-1 18690 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD64045  Capsella bursa-pastoris Craig D. Thomsen 2000-3-8 2037 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR212381  Capsella bursa-pastoris Craig D. Thomsen 2000-3-8 2037 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mi west of Hwy 20/16 intersection, milepost 3.00 310 Comment
  CHSC62923  Cardamine oligosperma Vernon H. Oswald; Lowell Ahart 1994-4-6 6056 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  CDA30193  Cardaria chalepensis D. Isle 2007-4-13 1633 Colusa East of Maxwell ~ 1 mile; south of Maxwell Road and East of Lyons Road in ditch between rice fields east of William Dirk s shop. Comment
  CHSC79446  Carduus pycnocephalus B. Castro 2000-5-2 1112 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  CDA15499  Carex G. F. Hrusa, T. D. Wilfred 1998-6-19 14636 Colusa North Coast Ranges; Near Goat Mtn. summit, adj. to intersection at Lake Co. boundary. NW side of summit area. Comment
  CAS-BOT-BC19164  Carex barbarae R. F. Hoover 1938-4-23 3210 Colusa Upper Sand Creek. Comment
  POM163445  Carex barbarae Roxana S. Ferris 1926-4-22 6315 Colusa Near Sycamore. Comment
  JEPS80377  Carex densa L. R. Heckard and J. Hickman 1981-6-22 5610 Colusa S side of E ridge of E Peak, Snow Mountain 1950 Comment
  UC1563913  Carex fracta Barbara Ertter 1989-7-1 8610 Colusa road to Goat Mt. Lookout 1.7 mi s Rt. M-10 (Bear Creek-Fouts Spring Rd.) (at head of S Fk Stony Creek, ca. 12 air mi wsw of Stonyford); S. Fk. Stony Creek 1463 Comment
  JEPS80866  Carex hoodii L. R. Heckard and J. C. Hickman 1981-7-31 5778 Colusa near Fouts Springs Overlook (e side of Snow Mt.); Snow Mt. 1798 Comment
  CAS-BOT-BC35776  Carex jonesii L. R. Heckard 1974-9-10 3913 Colusa Snow Mt.;northeast slope of West Peak 2072 Comment
  CAS-BOT-BC31226  Carex lenticularis var. impressa L. R. Heckard 1972-7-8 3059 Colusa Upper reaches of Dark Hollow Creek in saddle between East and West Peaks of Snow Mt. 1981 Comment
  JEPS80879  Carex luzulina var. luzulina L. R. Heckard and J. C. Hickman 1980-9-16 5456 Colusa Northeast slope of West Peak, cirque area between peaks, Snow Mt. 2011 Comment
  CDA21575  Carex nudata D. G. Kelch 2001-4-2 1 .043 Colusa N end of Walker Ridge. Comment
  CAS-BOT-BC119425  Carex obnupta Roxana S. Ferris 1917-4-15 607 Colusa Sycamore Slough. Comment
  CHSC76354  Carex praegracilis L. P. Janeway; B. Castro 1999-7-5 6499 Colusa At Bear Wallow Spring; on north side of Lovelady Ridge about 0.5 mi northeast of Pacific Point. 1045 Comment
  UCD163204  Carex praegracilis Craig D. Thomsen 2000-3-31 2069 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD61461  Carex praegracilis Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3907 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  UCD82620  Carex praegracilis Craig Thomsen; G. Harrington 2009-5-12 2889 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CAS-BOT-BC118348  Carex praegracilis Roxana S. Ferris 1917-4-17 625 Colusa Under trees, Sycamore Slough. Comment
  CAS-BOT-BC117541  Carex serratodens James D. Jokerst 1985-4-5 2213 Colusa Wilbur Springs Quad, near Coyote Peak. 608 Comment
  JEPS80863  Carex serratodens L. R. Heckard and J. C. Hickman 1981-7-30 5745 Colusa Trout Creek trail, se slope of Snow Mt. Snow Mt., Trout Creek trail 1661 Comment
  UCD67060  Carex serratodens Craig D. Thomsen 2008-3-20 2716 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. South side of Hwy 20, about 0.5 mile west of Hwy 16/20 intersection, at Colusa Co. milepost 2.63. 600 Comment
  UCD83755  Carex serratodens Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5952 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  UCD23340  Castilleja A. M. Shapiro 2003-8-19 s.n. Colusa Little Stony Creek. Comment
  HSC44462  Castilleja applegatei subsp. martinii R. York, Advanced Plant Taxonomy Lab 1978-4-22 131 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  JEPS124243  Castilleja applegatei subsp. martinii Lowell Ahart 2015-4-10 20013 Colusa About 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. Comment
  UCD163329  Castilleja applegatei subsp. martinii Craig D. Thomsen 2009-5-3 2797 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., 0.25 miles north of Hwy 20. Comment
  UCD81237  Castilleja applegatei subsp. martinii Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5401 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Edge of Bear Creek, near mouth of canyon located to the south of Brophy Canyon. 223 Comment
  UCD97120  Castilleja applegatei subsp. martinii Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6903 Colusa Along Brim Rd on east slope of Walker Ridge (Brim Rd becomes Bartlett Springs Rd). 438 Comment
  UCD13389  Castilleja applegatei subsp. martinii Steve Daniel 1986-4-13 86 -6 Colusa Colusa Co., 3.1 miles west of Rumsey on Hwy 16. N. facing slope. Comment
  CAS-BOT-BC257276  Castilleja attenuata George K. Helmkamp; E. A. Helmkamp 2011-4-1 17122 Colusa Eastern Foothills North Coast Ranges: Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  UCD122333  Castilleja attenuata Kim E. Steiner 1978-4-29 194 Colusa Walker Ridge Rd., 1.5 mi N of State Hwy 20. 777 Comment
  CHSC27511  Castilleja exserta Michael F. Henetz 1978-4-15 8 Colusa Ca. 150 m s of Hwy. 20, ca. .5 km w of junction of Hwy. 20 and Hwy. 16, ca. 29 km s of Williams. S central border of Section 36. 332 Comment
  UCD81230  Castilleja exserta Ellen Dean; K. Mawdsley, B. Rice 2009-5-6 5567 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Along Bear Creek south of Brophy Canyon, near old access road that leaves Hwy. 16 near milepost 6. 218 Comment
  UCD15433  Castilleja exserta Lisa Montang 1985-4-13 1 Colusa Colusa Co.; 3.8 miles north of Bear Valley Road and Highway 20 intersection; 390 Comment
  UCD82329  Castilleja exserta Robin McMaster 1973-4-15 320 Colusa 10 mi NW of Rumsey. Comment
  JEPS10302  Castilleja exserta subsp. exserta W. L. Jepson 1932-5-7 16255 Colusa 1 mi above Venado (sw Colusa County) 274 Comment
  JEPS124238  Castilleja exserta subsp. exserta Lowell Ahart 2015-4-1 20000 Colusa Inner North Coast Range. About 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles north of Highway 20. Comment
  JEPS16218  Castilleja exserta subsp. exserta Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3165 Colusa 8 mi nw Maxwell (along road Sites, on extreme w edge of the Sacramento Valley); Sacramento Valley Comment
  HSC85948  Castilleja exserta subsp. exserta Michalski, Raum, Hopson 1987-4-21 58 Colusa Leesville Rd. Comment
  CHSC115391  Castilleja foliolosa Lowell Ahart 2015-4-1 19988 Colusa Along small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  SEINET14045906  Castilleja foliolosa R. R. Halse 2011-3-25 8160 Colusa Along State Hwy. 20 just E of the Lake County Line, ca 14.6 miles E of its junction with State Hwy 53. 558 Comment
  CHSC33156  Castilleja miniata J. D. Jokerst; Dave Isle 1980-6-27 919 Colusa Banks of Frenzel Creek. Frenzel Creek Botanical Area ca 1.0 mi S of Stoney Cr. Comment
  JEPS81325  Castilleja miniata L. R. Heckard and J. C. Hickman 1982-7-6 5940 Colusa about 0.5 mi ne Summit Springs (s side of Snow Mt, e of trail); Snow Mt. 1645 Comment
  JEPS82029  Castilleja miniata Todd Keeler-Wolf 1983-6-22 715 Colusa 2 mi up Goat Mt. road; Little Stony Creek 411 Comment
  JEPS121787  Castilleja miniata subsp. miniata David Isle 2013-8-23 2049 Colusa COLUSA County, CA. W bankSalt Ck, ~ 150' NE of Dannis Dr Bridge on Isle Property. Comment
  UC1238982  Castilleja minor subsp. spiralis Freed W. Hoffman 1947-6-19 1663 Colusa Cook's Spring; North Coast Ranges Comment
  UCD163343  Castilleja minor subsp. spiralis Craig D. Thomsen 2007-7-31 s.n. Colusa Walker Ridge. East of Eaton Springs en route to Rathburn Mine. Comment
  UCD163307  Castilleja rubicundula Craig D. Thomsen 1997-4-7 1897 Colusa Bear Valley. About 5 miles north of Hwy 20. Comment
  UCD166311  Castilleja rubicundula subsp. lithospermoides Jack Major 1962-4-28 808 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  JEPS11156  Castilleja rubicundula subsp. rubicundula W. L. Jepson 1932-5-8 16284 Colusa Stonyford; w Colusa County 365 Comment
  JEPS121116  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  JEPS33902  Castilleja rubicundula subsp. rubicundula D. E. Breedlove 1963-5-30 5183 Colusa 17 mi e Bartlett Springs (on floor of Bear Valley); Bear Valley Comment
  RSA0118613  Castilleja rubicundula subsp. rubicundula Lowell Ahart 2013-5-1 18687 Colusa Inner North Coast Range. North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UC1282150  Castilleja rubicundula subsp. rubicundula Annetta Carter and Louise Kellogg 1953-6-20 3239 Colusa 6 mi n Wilbur Springs Junction (road to Leesville); Inner North Coast Ranges 400 Comment
  UCD63036  Castilleja rubicundula subsp. rubicundula Ellen Dean; Marjorie Phan and Gerald Dickinson 2008-4-27 4882 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Across Bear Creek from Cowboy Camp. 318 Comment
  CDA11400  Castilleja tenuis G. F. Hrusa, K. van Katwyk 1995-4-22 12120 Colusa Inner North Coast Ranges; flat on Walker Ridge Road, approx. 6 m. S of intersection with Bartlett Springs Rd. Comment
  SEINET10539694  Caulanthus Katherine L. Morris 1973-6-6 Morris 385 Colusa Chaparral woodland and sparse oaks; on hwy 20, 0.3 mi e of lake county line. Comment
  CHSC112311  Caulanthus lasiophyllus Lowell Ahart 2013-5-1 18681 Colusa Inner North Coast Range. Near a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD170130  Caulanthus lasiophyllus Jack Alderson 2016-5-1 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 2400 feet (730 m) west of the confluence of Brophy Creek with Bear Creek. 341 Comment
  CAS-BOT-BC48830  Ceanothus cuneatus Roxana S. Ferris 1917-4-14 572 Colusa foothills 7 mi west of Arbuckle - Rumsey Road Comment
  RSA399079  Ceanothus cuneatus Carolyn Sanford 1977-4-24 352 Colusa Above Barrel Springs Campground. 701 Comment
  UCD111738  Ceanothus cuneatus Beecher Crampton 1975-4-21 9165 Colusa 4 miles N.N.E. of Lodoga. Comment
  UC80064  Ceanothus cuneatus var. cuneatus T. S. Brandegee Apr 1889 701 Colusa Leesville Comment
  UCD170263  Ceanothus integerrimus D. O. Burge 2016-11-3 2187 Colusa Little Stony Creek watershed, roadside on Goat Mountain Road. 415 Comment
  RSA757814  Ceanothus jepsonii var. albiflorus Dylan O. Burge 2008-5-27 DOB 997 c Colusa Rathburn-Petray Mine complex, east of Eaton Springs, 12.3 km 193 degrees true south-southwest of Leesville. 700 Comment
  UCD81262  Ceanothus oliganthus var. sorediatus Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5427 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  UCR225463  Ceanothus oliganthus var. sorediatus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5117 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail 548 Comment
  HSC98207  Ceanothus oliganthus var. sorediatus Steven Lagos 1974-5-4 43 Colusa 747 Comment
  CHSC84199  Centaurea melitensis Lowell Ahart 2003-7-14 10387 Colusa By a wash, on the east side of Bear Valley Road, about 3 miles northwest of Highway 20. 381 Comment
  CHSC94524  Centaurea melitensis Lowell Ahart 2006-8-9 13169 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS104358  Centaurea melitensis Lowell Ahart 2003-7-14 10387 Colusa By a wash, on the e side of Bear Valley Rd, ca 3 mi nw of Highway 20. 381 Comment
  UCD82829  Centaurea solstitialis Gina Darin; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Along trail, north side of Thompson Creek. 374 Comment
  POM53290  Centaurea solstitialis W. R. Mumma 1897-9-3 s.n. Colusa Grand Island Comment
  SEINET11860767  Centaurea solstitialis C. L. Abbott 1926-6-27 s.n. Colusa Colusa Comment
  CHSC107286  Centaurium tenuiflorum L. P. Janeway; B. Castro 2011-7-9 10512 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Tehama-Colusa Canal. South end of the area near the Canal fence;. upland grassland along dirt road route (into the beehive area). 51 Comment
  UCR227905  Centaurium trichanthum Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5060 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20, area of ranch west of Hwy 16, near bridge that spans Bear Creek, c. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near south end of bridge, east side of creek 555 Comment
  UCD66949  Centromadia fitchii Ellen Dean; Davis Botanical Society 2008-5-31 4994 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  CAS-BOT-BC281221  Centromadia fitchii Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  CAS-BOT-BC272813  Centromadia parryi subsp. parryi H. M. Hall 1930-10-3 12938 Colusa Southwestern Colusa County. North of Wilbur Springs on road to Stonyford Comment
  UCD63776  Centromadia parryi subsp. parryi Craig D. Thomsen 2008-5-31 2757 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Cowboy Camp area, west side of Hwy 16, 1 mile south of Hwy 20. In meadow, west of public viewing area between Bear Creek and hillslopes to the west. 279 Comment
  JEPS104140  Centromadia parryi subsp. rudis Lowell Ahart 2003-8-15 10510 Colusa On the south side of Highway 20, ca 1 mi sw of Williams. 27 Comment
  UC727676  Centromadia parryi subsp. rudis Milo S. Baker 1946-9-5 11624 Colusa 3 mi w of Colusa; Williams Comment
  UCD16094  Centromadia pungens J. Schmierer 1999-4-27 s.n. Colusa Exact location unknown. Comment
  CHSC89831  Centromadia pungens subsp. maritima B. Castro; S. Innecken 2001-3-20 1217 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  JEPS38150  Centromadia pungens subsp. pungens W. L. Jepson 1934-5-3 16600 Colusa n of Colusa (Stegeman Station) Comment
  JEPS105679  Centromadia pungens subsp. pungens L. P. Janeway 2002-4-25 7525 Colusa Sacramento Valley; vicinity of Funks Creek and Tehama - Colusa Canal 51 Comment
  UCD163000  Cerastium glomeratum Craig D. Thomsen 2000-3-31 2164 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  CAS-BOT-BC293729  Cercis occidentalis Mona Bourell 1997-3-29 5771 Colusa Mendocino National Forest, Dixie Glade Campground 918 Comment
  CHSC81263  Cercis occidentalis J. Trizzino 2001-3-31 13 Colusa Bear Valley Road about 2 mi from southern entrance to valley along east side of road. 408 Comment
  CHSC84633  Cercis occidentalis Matt Quinn 2001-3-31 38 Colusa Found along drainage flowing out of Bear Valley, near Wilbur Hot Springs, north of Highway 20. 405 Comment
  UCR206399  Cercis occidentalis George K. Helmkamp, E. A. Helmkamp 2009-3-11 14378 Colusa Inner North Coast Range Foothills, along CA-20, 9.7 miles southwest of Williams beside Salt Creek 107 Comment
  CHSC1542  Cercocarpus betuloides E. Gabel 1935-5-10 Colusa Stonyford. 335 Comment
  UCD83634  Cercocarpus betuloides Fanny Ye; with PLB 102 class 2010-5-2 5 Colusa East slope of Walker Ridge. Along Brim Road, between Bear Valley and Walker Ridge. 493 Comment
  UCR206710  Cercocarpus betuloides var. betuloides George K. Helmkamp, E. A. Helmkamp 2009-3-17 14397 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 7.0 miles south of the junction with CA-20; just north of the Yolo County line 194 Comment
  HSC71298  Cercocarpus montanus var. glaber Thomas W. Nelson, Jane P. Nelson 1979-4-12 4628 Colusa Along Stony Creek below Digger Pine Campground Comment
  JEPS15566  Chaenactis douglasii var. douglasii G. Thomas Robbins with L. R. Heckard 1956-7-25 3715 Colusa above Dark Hollow Creek (a trib. of Middle Fork Stony Creek, s flank of Snow Mt. East, between Snow Mt. East and Snow Mt. West); Snow Mt. East, Middle Fork Stony Creek 1981 Comment
  CDA12016  Chaenactis glabriuscula G. F. Hrusa 1990-4-8 7668 Colusa North Coast Biodiversity Arena; Road into Bear Valley from the S, passing Wilbur Springs, and originating at Hwy. 20. Comment
  HSC45751  Chaenactis glabriuscula var. glabriuscula Sheila Logan 1978-4-22 82 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  CHSC86521  Chaenactis glabriuscula var. heterocarpha B. Castro; Beth Hendrickson 2003-3-19 1394 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 259 Comment
  UC630425  Chaenactis glabriuscula var. heterocarpha Annetta Carter 1938-5-8 1394 Colusa 4 mi se of Wilbur Springs; Inner North Coast Ranges, Bear Creek Canyon Comment
  CHSC113046  Chamaesyce maculata Lowell Ahart 2013-10-1 19103 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CHSC61423  Chamaesyce serpillifolia subsp. serpillifolia Vernon H. Oswald; Joseph Silveira 1993-8-16 5803 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, center N side of Tract 44, near the S boundary of the refuge. On the N bank of Hunters Creek. 24 Comment
  CHSC84965  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2003-10-23 10665 Colusa On the east strand of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  JEPS108745  Chamaesyce serpillifolia subsp. serpillifolia Lowell Ahart 2006-8-9 13115 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  SBBG67773  Chamaesyce serpillifolia subsp. serpillifolia Mrs. H. P. Bracelin 1931-10-1 565 Colusa Indian Crk, Lodoga Comment
  UC525846  Chamaesyce serpyllifolia Mrs. H. P. Bracelin 1931-10-1 566 Colusa 5 mi s Stonyford; Big Stony Creek 243 Comment
  UC73410  Chamaesyce serpyllifolia H. P. Chandler 1905-9-14 Colusa Princeton Comment
  JEPS75724  Cheilanthes gracillima L. R. Heckard 1974-9-9 3859 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt 1828 Comment
  JEPS80052  Cheilanthes gracillima L. R. Heckard with J. Hickman 1979-6-15 5052 Colusa e trail from Frog Pond to cirque of e and w peaks Snow Mt (ne slope of West Peak ridge) 1981 Comment
  CHSC77561  Chenopodium album Heidi West; Jenny Marr, Caroline Warren, Natalie Wight 1998-6-11 Colusa Vicinity of Salt Lake and Sites. 97 Comment
  CHSC94440  Chenopodium album Lowell Ahart 2006-8-9 13120 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA724893  Chenopodium album L. Ahart 2006-8-22 13221 -A Colusa south side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  CHSC94513  Chenopodium berlandieri Lowell Ahart 2006-8-22 13220 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCR201556  Chenopodium berlandieri George K. Helmkamp, E. A. Helmkamp 2008-10-14 14272 Colusa Sacramento Valley, along CA-20, 2 miles west of Meridian 14 Comment
  RSA718051  Chenopodium botrys L. Ahart 2006-8-9 13098 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3.5 miles (air) west of Stonyford. 455 Comment
  UC1191335  Chenopodium strictum var. glaucophyllum Herbert L. Mason and Verne Grant 1946-8-7 12978 Colusa 8 mi n Colusa; Butte Sink Comment
  JEPS80466  Chimaphila menziesii Alice Q. Howard 1972-7-10 8 Colusa wet mossy spring area crossing trail from Fouts Camp to Box Springs (highest of 2 areas on n. side of ridge separating Trout & Paradise Creeks); Snow Mt. 1676 Comment
  UCD57927  Chloris gayana Beecher Crampton 1961-7-20 5932 Colusa 2 miles S of Grimes. Comment
  SEINET11696150  Chloris gayana Unknown 1961-7-20 5932 Colusa 2 mi S of Grimes Comment
  CAS-BOT-BC497619  Chlorogalum angustifolium Volney Rattan 1917-1-1 s.n. Colusa Stony Cr. Comment
  UCD63132  Chlorogalum pomeridianum var. pomeridianum Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4933 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 348 Comment
  CHSC86966  Chorizanthe membranacea B. Castro; Michelle Cedarborg 2003-5-6 1430 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. 219 Comment
  JEPS57654  Chorizanthe membranacea W. L. Jepson 1932-5-7 16263 Colusa valley 2 mi above Venado (western Colusa County) Comment
  CAS-BOT-BC277955  Cirsium cymosum James Jokerst 1985-4-5 2228 Colusa Near Coyote Peak 608 Comment
  UCD165930  Cirsium cymosum Ellen Dean; with Tom Starbuck 2016-4-24 8841 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 391 Comment
  UCD66565  Cirsium cymosum Craig D. Thomsen 2001-5-24 2520 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  JEPS81831  Cirsium cymosum var. cymosum L. R. Heckard 1969-5-28 2230 Colusa just below Candy Bucket Springs (on Stoneyford-Fouts Spring road) 670 Comment
  UCD57628  Cirsium occidentale var. venustum Michele Lanctot; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Northern edge of trail. 361 Comment
  UCD81256  Cirsium vulgare Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5421 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  UC71781  Citrullus colocynthis var. lanatus H. P. Chandler Oct. 1905 Colusa Princeton Comment
  UCD57862  Clarkia Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 49 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. South terrace of Thompson Creek about 300 feet upstream of breached dam close to Road Kill Cafe. 395 Comment
  CAS-BOT-BC162597  Clarkia affinis C. G. Phillips; L. Cole; S. A. Haultain; K. B. Barrows 1984-4-29 35 Colusa Bear Valley Rd., 2 mi. N of Hwy 20 365 Comment
  CHSC86125  Clarkia affinis Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  UCD57561  Clarkia affinis Stephanie Castle; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, on small rise south of Craig Creek. 304 Comment
  CAS-BOT-BC160914  Clarkia amoena subsp. amoena C. Hart Merriam 1923-1-1 s.n. Colusa Indian rancheria, Stony Ford Comment
  CAS-BOT-BC164151  Clarkia concinna Roxana S. Ferris 1926-4-23 6408 Colusa On grade beyond the Mountain House, Williams - Stonyford Road Comment
  SD52963  Clarkia concinna Peter H. Raven 1962-5-31 17909 Colusa State Highway 20, 2.5 miles east of Lake County Line. Comment
  UCD82196  Clarkia concinna Ellen Dean; G. Harrington, C. Thomsen,R. Wilmarth,Chiao-Yi Cheng 2009-5-20 5696 Colusa Walker Ridge. Til Jones Spring area along Walker Ridge Road. 833 Comment
  CAS-BOT-BC164148  Clarkia concinna D. E. Breedlove 1963-5-30 5192 Colusa 5 miles E of Leesville Comment
  RSA0020963  Clarkia concinna Joan Stewart 1998-6-10 758 Colusa Bear Valley Comment
  JEPS108811  Clarkia concinna subsp. concinna Lowell Ahart 2006-6-11 12668 Colusa On the west side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  RSA163460  Clarkia concinna subsp. concinna Roxana S. Ferris 1926-4-23 6408 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UCD57721  Clarkia concinna subsp. concinna Jordan Thompson; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. North side of Craig Creek on south side of unimproved road. 335 Comment
  POM216174  Clarkia concinna subsp. concinna D. D. Keck 1933-5-30 2401 Colusa 1 mile east of Lake County line, west of Wilbur Springs Comment
  HSC66132  Clarkia gracilis Cathie Goldberg, Lynn Kunstman, Geoff Walsh, Lauren Philbrick 1980-4-19 52 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  JEPS105736  Clarkia gracilis subsp. albicaulis David Gowen 2004-5-18 88 Colusa South of Stonyford. Approx. 7/10 mile along Goat Mt. Road from its junction with the paved road to Stonyford. Comment
  RSA151824  Clarkia gracilis subsp. albicaulis Francia Chisaki, Helen K. Sharsmith 1959-5-27 1339 Colusa Near Cooks Creek, about 1/4 mile east of Cooks Springs Comment
  UC930771  Clarkia gracilis subsp. albicaulis A. A. Heller 1916-6-6 12354 Colusa on grade about 3 mi w Leesville; Coast Range Comment
  JEPS80137  Clarkia gracilis subsp. gracilis L. R. Heckard with J. Hickman 1980-7-2 5297 Colusa ca. 10 mi w Stonyford (just above Summit Spring entrance to Snow Mt. trail, Colusa-Lake County boundary) 1630 Comment
  CHSC79534  Clarkia gracilis subsp. tracyi G. F. Hrusa 1998-6-19 14597 Colusa Northern California. North Coast Ranges. Along Little Stony Creek, on Goat Mtn. Rd. ~ 1/2 km. W of intersection with Lodoga-Stonyford Rd. UTM: 10S, 05401 N, 43499 E. 400 Comment
  HSC94165  Clarkia gracilis subsp. tracyi G. Fred Hrusa 1998-6-19 14597 Colusa Along Little Stony Creek, on Goat Mtn. Rd., ~0.5 km W of intersection with Lodoga-Stonyford Rd. 400 Comment
  CHSC85962  Clarkia purpurea subsp. quadrivulnera Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 152 Comment
  UC125400  Clarkia purpurea subsp. quadrivulnera Miss M. Alice King 1905-1 Colusa near Arbuckle (near College City); Sacramento Valley Comment
  UCD82122  Clarkia purpurea subsp. quadrivulnera Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5650 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UCR206289  Clarkia purpurea subsp. quadrivulnera George K. Helmkamp, E. A. Helmkamp 2009-5-20 14739 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CHSC79780  Clarkia rhomboidea G. F. Hrusa 1998-6-19 14604 Colusa the North Coast Ranges. Above upper Little Stony Creek. Goat Mtn. Rd. ~2 km. W of campground. UTM: 10S 05351 N, 43466 E. 490 Comment
  SD133953  Clarkia rhomboidea Barbara Ertter 1989-7-1 8597 Colusa road to Goat Mt Lookout 2.2 miles south of Route M-10 (Bear Creek-Fouts Spring Road) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford; 1500 Comment
  UC1299410  Clarkia rhomboidea Freed W. Hoffman 1948-6-28 2541 Colusa between Upper Letts Valley and Lower Letts Valley; North Coast Ranges Comment
  RSA537479  Clarkia rhomboidea Barbara Ertter 1989-7-1 8597 Colusa Road to Goat Mt Lookout 2.2 miles S of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of S Fk Stony Creek, ca 12 airmiles WSW of Stonyford. 1500 Comment
  UCR206290  Clarkia unguiculata George K. Helmkamp, E. A. Helmkamp 2009-5-20 14738 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  CHSC62848  Claytonia exigua subsp. exigua Vernon H. Oswald; Lowell Ahart 1994-3-23 6015 Colusa Frenzel Creek Research Natural Area on the S side of Liitle Stony Creek, in the section on the E side of Frenzel Creek, S of Stonyford. 518 Comment
  JEPS124232  Claytonia exigua subsp. exigua Lowell Ahart 2015-4-1 19994 Colusa Inner North Coast Range. 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Comment
  JEPS86625  Claytonia exigua subsp. exigua L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6705 Colusa 0.5 km w Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1500 Comment
  UCD65633  Claytonia exigua subsp. exigua Craig D. Thomsen 2000-4-12 2136 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  UCSC010465  Claytonia exigua subsp. exigua Dylan M. Neubauer, Tim Forsell 2016-3-31 600 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  CHSC112263  Claytonia exigua subsp. glauca Lowell Ahart 2013-5-1 18677 Colusa Inner North Coast Range. On the south side of the wash, north side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  UCD162997  Claytonia parviflora Craig D. Thomsen 2000-3-31 2086 Colusa Bear Creek Botanical Management Area. Roadside shoulder of Hwy 20 (south side), about 0.2 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC101069  Claytonia parviflora subsp. parviflora David W. Isle 2002-4-18 1654 Colusa N of Fouts Springs, N of Chlorinator Building and Rd to Bathhouse Trail (Snow Mtn), N aspect of E drainage. In chamise site burned in 8/8/01 Trough Fire and part of Hydromulch Soil Erosion Study Plot. 524 Comment
  UC1745698  Claytonia parviflora subsp. parviflora Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-8 1379 Colusa Between Leesville & Stonyford. 6.6 mi. S of Lodoga. 3 mi. N of Leesville. Comment
  RSA755471  Claytonia parviflora subsp. parviflora David W. Isle 2002-4-18 1654 Colusa North of Fouts Springs, North of Chlorinator Building and Road to Bathhouse Trail (Snow Mountain). North aspect of east drainage. 524 Comment
  CHSC91500  Claytonia parviflora subsp. viridis D. Isle 1995-5-20 401 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Just S of Mrs. Brown's trailer, now owned by Harry Petersen, 10' from trailer. 377 Comment
  UCD56942  Claytonia perfoliata Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3544 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 349 Comment
  UC1051737  Claytonia saxosa Helen K. Sharsmith 1953-6-20 4292 Colusa summit of Goat Mountain Inner North Coast Ranges, Mendocino National Forest, Goat Mt (Lake-Colusa boundary) 1864 Comment
  SFV8355  Clematis lasiantha D. Grau 1972-4-1 4 Colusa Highway 16, 5 miles south of junction with Highway 20. Comment
  CAS-BOT-BC92546  Clematis ligusticifolia A. F. Hough 1924-6-22 3 Colusa California Forest. McDaniels R.S. 914 Comment
  CHSC111245  Clematis ligusticifolia B. Castro 2008-7-10 1773 Colusa Sacramento Valley. Along S bank of Sacramento River, ca 5 mi N of town of Colusa, just N of Reservation Road; in undesignated section near Colusa Rancheria. 18 Comment
  UC72761  Clematis ligusticifolia Miss M. Alice King 1905-1 Colusa along slough near College City; Sacramento Valley Comment
  UCD59793  Coix lacryma-jobi W. M. Mathisen 1921-11-1 s. n. Colusa Princeton. Comment
  CHSC25053  Collinsia grandiflora G. N. Steger 1972-4-10 Colusa Along road cuts of Hwy. 20, s of Lucerne along the shore of Clear Lake. Comment
  CHSC25076  Collinsia grandiflora S. R. Poe 1974-3-30 27 Colusa Occuring frequently in open grassy fields, 22.5 mi. w of Williams, adjacent to highway 20. 243 Comment
  CHSC27553  Collinsia grandiflora Scott E. Patton 1978-4-9 8 Colusa Ca. 0.3 m w of jct of Hwys. 20 and 16, s side of Bear Creek, ca. 18 m sw of Williams. 321 Comment
  CHSC55589  Collinsia grandiflora Jennie J. Dubose 1991-4-6 20 Colusa Ca. 0.3 mi w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  UCSB63619  Collinsia grandiflora Maslin, Linyi 1981-4-15 Colusa Ca. 0.5 km w of jct of Hwys 20 & 16; s side of Bear Creek; Ca. 27 km sw of Williams; Wilbur Springs Quadrangle, 15'; S central border of Sect. 36. T14N, R5W 319 Comment
  UCD66532  Collinsia heterophylla Craig D. Thomsen 2003-5-30 2257 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR104588  Collinsia heterophylla Peter S. Lathrop 1993-4-15 s.n. Colusa North Coastal Range, along California State Highway 16, 5 miles south of State Highway 20 305 Comment
  UC2016539  Collinsia heterophylla Richard Olmstead 1984-4-28 523 Colusa North slope on Walker Ridge Road, ca. 2.4 miles north of CA 20. Road follows ridge that is Lake Co. - Colusa Co. line. Comment
  UC204795  Collinsia rattanii Volney Rattan 1884-6-15 Colusa w slope of Black Butte Black Butte Comment
  UCD58103  Collinsia sparsiflora Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3350 Colusa Payne Ranch. Along Hwy. 20, just E of Lake Co. border. Ca. 3 road miles west of juncture with Hwy. 16, ca. 0.4 road mile east of Destanella Flat. South side of road. 536 Comment
  CDA34091  Collinsia sparsiflora P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  JEPS15270  Collinsia sparsiflora var. collina Rimo Bacigalupi with G. T. Robbins, G. L. Stebbins, C. McMillan, S. Galen Smith and Peter Kamb 1950-4-16 3114 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  JEPS6337  Collinsia sparsiflora var. sparsiflora Alice King 1906-5-1 Colusa College City College Cityu Comment
  CHSC48648  Collomia diversifolia Vernon Oswald 1984-5-2 1167 Colusa Mendocino Nat. Forest, Fouts Spring Rd. (M10; 18N01) 5.7 mi w of Stonyford. On a road cut. 609 Comment
  HSC31583  Collomia diversifolia Thomas E. Higley 1974-5-4 70 Colusa 3/4 mi. N of T junction of Indian Valley. 854 Comment
  JEPS94201  Collomia diversifolia Vernon Oswald and Lowell Ahart 1998-5-7 9006 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UC1191132  Collomia diversifolia Herbert L. Mason 1953-5-5 14519 Colusa s end Cracker Box Ridge (along creek); Little Stoney Creek Comment
  CHSC67605  Cordylanthus palmatus James D. Jokerst 1988-8-23 3039 Colusa Colusa National Wildlife Refuge S of Willows, in Pond 3, E and adjacent to Ohm Rd. in southern-most cell E of the road. Comment
  JEPS83553  Cordylanthus palmatus R. D. Stone 1987-8-26 850 Colusa w side of Ohm Rd ca 0.5 mi n jct. w/ Ware Rd. (corner of Colusa Nat'l Wildlife Refuge); Colusa Nat'l Wildlife Refuge, Arbuckle 7.5' quad. 13 Comment
  RSA0084708  Cordylanthus palmatus Ellen Cypher 2005-8-22 2005 -023 Colusa Delevan National Wildlife Refuge, Tract 12, CNDDB EO# 13 18 Comment
  JEPS68404  Cordylanthus pilosus subsp. pilosus L. R. Heckard 1972-7-10 3147 Colusa Ladoga 487 Comment
  UCD123116  Cordylanthus pringlei Craig Thomsen; Art Shapiro 2004-9-16 s.n. Colusa along Cool Springs Road. Comment
  UCD63123  Cordylanthus tenuis Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4953 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 416 Comment
  SBBG50832  Cornus glabrata J. K. Clark 1966-5-8 23 Colusa Lodoga to Stonyford Rd, 2.5 mi NW of Lodoga 320 Comment
  SFV8758  Cornus glabrata J. K. Clark 1966-5-8 23 Colusa On Lodoga to Stongford Road, 2.5 miles northwest of Lodoga. 320 Comment
  UC1776781  Cornus glabrata G. F. Hrusa 1989-5-7 6086 Colusa North Coast Ranges; Road to Cedar Mtn., along Little Stony Creek, approx. 2.5 miles above intersection with Stonyford-Lodoga Rd. Shaded area beneath Populus fremontii 450 Comment
  UCD41212  Cornus glabrata John Snelling 1986-5-17 3 - Colusa 2.8 mi. west of Stonyford along Fouts Spring Road. Comment
  CHSC75703  Cornus sericea subsp. occidentalis Vernon H. Oswald; Lowell Ahart 1999-6-22 9777 Colusa Lily Pond near Upper Letts Lake west of Stonyford. 1243 Comment
  JEPS80825  Cornus sericea subsp. sericea L. R. Heckard and J. Hickman 1981-7-31 5797 Colusa e. side Snow Mt. (Dark Hollow Creek) 1584 Comment
  CHSC100407  Cotula australis John Dittes; Josephine Guardino 2008-3-14 1513 Colusa Great Central Valley; Sacramento Valley; between Butte Sink and Sacramento River, north of Sutter Buttes; ca. 1.6 air-miles south of Gridley Road, ca. 1.1 air-miles west of Drumheller Slough. 17 Comment
  CDA36236  Cotula coronopifolia G. K. Helmkamp, E. A. Helmkamp 2009-3-11 14381 Colusa Sacramento Valley; Along CA Hwy. 20, 0.1 mile east of its junction with I-5, north end of Williams. Comment
  CHSC107965  Cotula coronopifolia B. Castro; L. Janeway 2011-4-27 1863 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; aproximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Approximate center of large +- alkaline marsh. 49 Comment
  CHSC83313  Cotula coronopifolia Jenny Marr; Heidi West, Caroline Warren, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek, Logan Ridge, Golden Gate, and Antelope Valley. 121 Comment
  UCR206355  Cotula coronopifolia George K. Helmkamp, E. A. Helmkamp 2009-3-11 14381 Colusa Sacramento Valley, along CA-20, 0.1 mile east of its junction with I-5, north end of Williams 49 Comment
  SEINET3872208  Crassula connata Richard R. Halse 2010-3-20 7827 Colusa Williams; by junction of 5th Street and B Street.; 0 25 Comment
  UC75673  Crassula connata var. erectoides Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC62886  Crassula tillaea Vernon H. Oswald 1994-3-14 5993 Colusa Refuge located ca. 7 mi S of Willows, in the parking area in the NE corner of Tract 41. Sacramento National Wildlife Refuge. 25 Comment
  UCD84428  Crocanthemum scoparium Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6043 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir. 683 Comment
  CHSC84955  Croton setiger Lowell Ahart 2003-10-23 10676 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  SACT000805  Crypsis aculeata Herbert Mason 1945-7-11 Colusa Alkali Plains three miles above Colusa Comment
  SACT000807  Crypsis niliacea Herbert Mason 1945-7-11 Colusa Alkali Plains 3 miles above Colusa Comment
  CAS-BOT-BC190086  Crypsis schoenoides Herbert L. Mason 1945-7-11 12642 Colusa Near Butte Creek. Butte Lodgd Outing Club, three miles above Colusa. Comment
  CDA16109  Crypsis schoenoides G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15244 Colusa North Coast Ranges; Along Leesville Rd., +/- 1 mi S of Lodoga. 320 Comment
  CHSC107967  Crypsis schoenoides B. Castro; L. Janeway 2011-7-9 1896 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 0.3 mi NE of Tehama-Colusa Canal. In small vernally moist pothole off S edge of a grain field, at NW end of vernally moist swale connected to a large +- saline/alkaline wetland/marsh about 0.2 mi to the S. 49 Comment
  CHSC77404  Crypsis schoenoides Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CHSC94448  Crypsis schoenoides Lowell Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  POM313219  Crypsis schoenoides H. L. Mason 1945-7-11 12642 Colusa Alkali plains near Butte Creek; Butte Lodge Outing Club, three miles above Colusa Comment
  RSA268077  Crypsis schoenoides J. R. Reeder, C. G. Reeder 1972-6-6 5658 Colusa ca. 8 miles W of Live Oak, one mile S of Wildlife Area headquarters. 183 Comment
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Aug 18 2014
  RSA724948  Crypsis schoenoides L. Ahart 2006-8-9 13116 Colusa North side and under the bridge across Stony Creek, just north of Stonyford; between the southwest 1/4 and southeast 1/4 348 Comment
  UCD59931  Crypsis schoenoides Beecher Crampton 1958-6-27 4987 Colusa 3.5 miles south of Colusa. Comment
  CHSC115632  Crypsis schoenoides David Isle; Rhonda Isle 2014-9-27 2145 Colusa Northern Sacramento Valley foothills: W side East Park Reservoir, ~0.3 mi S of boatlaunch; within ~ 20 yards of normal lake edge in drying clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  RSA756393  Crypsis vaginiflora Barbara Ertter, Elizabeth Nesse, Laura Fujii, Dawn Espindola 1989-10-21 8873 Colusa SE end of East Park Reservoir N of Lodoga. 366 Comment
  UC1950107  Crypsis vaginiflora Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8873 Colusa SE end of East Park Reservoir N of Lodoga Comment
  UCD56671  Cryptantha Jack Alderson 2007-3-25 7 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 555 Comment
  UCD56918  Cryptantha Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3521 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. In Craig Canyon. 334 Comment
  OBI20715  Cryptantha excavata Robert F. Hoover 1968-5-27 11099 Colusa Bear Creek cyn, N of Hwy 20 (near Wilbur Springs) Comment
  UC1392805  Cryptantha excavata R. F. Hoover 1968-5-27 11099 Colusa near Wilbur Springs (n of Hwy 20, Bear Creek canyon); Bear Creek Comment
  JEPS81272  Cryptantha flaccida L. R. Heckard and J. C. Hickman 1982-7-5 5882 Colusa s of (slope below area) Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD58108  Cryptantha flaccida Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3360 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. South side of road. Grassland area to the SSE of Destanella Flat. 572 Comment
  UCR233290  Cryptantha flaccida George K. Helmkamp, E. A. Helmkamp 2011-4-1 17133 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 0.4 miles southeast of Sites 93 Comment
  UC763082  Cryptantha hispidula R. F. Hoover 1941-5-2 4983 Colusa just e Lake County line (on Williams-Clear Lake highway) Comment
  UCD63018  Cryptantha hispidula Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4670 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the west of Cowboy Camp on the west side of Bear Creek. 409 Comment
  CHSC146  Cryptantha intermedia V. Holt 1935-5-17 Colusa Stonyford. Comment
  UC1212585  Cryptantha intermedia Francia Chisaki and Helen Sharsmith 1959-5-26 1331 Colusa 5 air mi w Stonyford (above Red Bridge Camp); Inner North Coast Ranges, Mendocino National Forest Comment
  UC726038  Cryptantha intermedia A. A. Heller 1940-5-6 15581 Colusa near Lake County line on State Highway 20 (near a bench mark) 232 Comment
  CHSC112215  Cryptantha intermedia var. intermedia Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18630 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC79477  Cryptantha microstachys B. Castro; L. P. Janeway 2000-5-4 1142 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 249 Comment
  CDA15473  Cryptantha muricata G. F. Hrusa, WTD 1998-6-19 14610 Colusa North Coast Ranges; Ridge above Little Stony Creek drainage on Goat Mtn. Rd. below intersection with USFS Pacific Ridge Rd. (M5). Comment
  UC2014138  Cryptantha muricata Ellen Dean, C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6058 Colusa Colusa County. Walker Ridge. Along Walker Ridge Rd, E side of road in turnout. Just past Pinus attenuata groves. Comment
  UCD84446  Cryptantha muricata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6054 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  UC596361  Cryptantha nemaclada R. F. Hoover 1938-4-24 3217 Colusa w of Arbuckle (Sand Creek foothills); Sand Creek Comment
  CAS-BOT-BC33124  Cryptantha nemaclada M. K. Curran 1884-1-1 s.n. Colusa unspecified Comment
  JEPS80776  Cryptantha simulans L. R. Heckard and J. Hickman 1981-7-30 5749 Colusa se side Snow Mt. (Trout Creek trail); , Trout Creek 1630 Comment
  JEPS83805  Cryptantha torreyana L. R. Heckard and J. Hickman 1980-7-3 5348 Colusa ca 10 mi w Stonyford (just w of Summit Springs, sw Snow Mt, Colusa-Lake County boundary); Snow Mt. 1548 Comment
  UC1177889  Cryptantha torreyana Peter M. Ray 1950-4-16 1733 Colusa canyon of North Fork Big Stony Creek ca 1 mi below crossing of the stream North Fork Big Stony Creek Comment
  UCD66964  Cryptantha torreyana Ellen Dean; Davis Botanical Society 2008-5-31 5008 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  UCR212290  Cryptantha torreyana Ellen Dean, Davis Botanical Society 2008-5-31 5008 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground 1312 Comment
  UCD110847  Cupressus macnabiana Christopher Mallek 2008-1 FC- 1 Colusa Frenzel Creek. 654 Comment
  JEPS87788  Cupressus sargentii Vernon H. Oswald and Lowell Ahart 1994-3-23 6010 Colusa s side Little Stony Creek (in section on e side of Frenzel Creek, s of Stonyford); Frenzel Creek Research Natural Area 518 Comment
  UC1585395  Cupressus sargentii R. Raiche 1989-11-1 90339 Colusa W of Williams, NW of Wilbur Springs, Walker Ridge, Freshwate Branch of E Fork Sulphur Creek between Signal Rock and Oak Grove 730 Comment
  JEPS75861  Cuscuta californica L. R. Heckard 1974-9-10 3888 Colusa e of East Peak (along upper reaches of Dark Hollow Creek); Snow Mt., Dark Hollow Creek 2011 Comment
  UC1116696  Cuscuta californica Beecher Crampton 1961-7-20 5935 Colusa 4 mi se Grimes (along Knight's Landing Road) Comment
  JEPS80873  Cuscuta californica L. R. Heckard and J. C. Hickman 1980-9-15 5436 Colusa n of road at Summit Springs, Lake-Colusa County boundary Snow Mt., Summit Springs 1524 Comment
  UCD61441  Cuscuta californica var. californica Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3886 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1500 ft NW of parking lot. 335 Comment
  UCD81892  Cuscuta californica var. californica Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5776 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. SW of Roadkill Cafe near stock pond. 429 Comment
  CHSC46872  Cycloloma atriplicifolium Vernon Oswald 1989-9-12 4009 Colusa Goat Mtn Rd 2.1 mi wsw of Lodoga-Stonyford Rd, ca. 6 mi (air) s of Stonyford. On the n side of Little Stony Creek. 411 Comment
  UCD72464  Cynodon dactylon Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3798 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CHSC62839  Cynoglossum grande Vernon H. Oswald; Lowell Ahart 1994-3-23 6023 Colusa Little Stony Creek just W of Digger Pine Campground on Goat Mtn. Rd., S of Stonyford. On slopes along the creek. 490 Comment
  HSC62811  Cynoglossum grande Rick Lundquist 1979-4-14 19 Colusa Buck Flat, on Walker Ridge Rd. 884 Comment
  RSA0060513  Cynoglossum grande Richard R. Halse 2014-3-25 9032 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  UCD56936  Cynoglossum grande Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3538 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  UC1100564  Cyperus acuminatus Herbert L. Mason and Verne Grant 1946-8-6 12969 Colusa pond 2.7 mi. n. Colusa (between Sacramento R. and Butte Creek); Butte Sink Comment
  CAS-BOT-BC114780  Cyperus acuminatus Herbert L. Mason; Verne Grant 1946-8-6 12969 Colusa Pond 2.7 miles N of Colusa between Sacramento River and Butte Creek. Comment
  CAS-BOT-BC114782  Cyperus acuminatus Herbert L. Mason; Verne Grant 1946-8-6 12969 Colusa Pond 2.7 miles N of Colusa between Sacramento River and Butte Creek. Comment
  JEPS110388  Cyperus difformis Lowell Ahart 2006-8-9 13143 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford 347 Comment
  SEINET7581552 Image available Cyperus difformis Lowell Ahart 2006-8-9 13143 Colusa North side and just east of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC1100541  Cyperus difformis Malcolm A. Nobs and S. Galen Smith 1949-9-9 1877 Colusa 3 mi. w. Williams Comment
  UCD141006  Cyperus difformis V. C. Bryant 1931-6-24 2205 Colusa Colusa. Comment
  UCD141018  Cyperus difformis Herbert L. Mason; Verne Grant 1946-8-7 12983 Colusa 8 miles north of Colusa. Comment
  CAS-BOT-BC114573  Cyperus eragrostis Roxana Judkins [later Mrs. Ferris q.v.] Stinchfield 1916-7-9 419 Colusa On Phillips ranch, near Sycamore. Comment
  RSA0051222  Cyperus eragrostis Richard Carter 2006-7-31 17124 Colusa 3.7 mi SSE Colusa, jct. Hwy CA 20 and Hwy CA 45. Comment
  CHSC115629  Cyperus eragrostis David Isle; Rhonda Isle 2014-9-27 2141 Colusa Northern Sacramento Valley Foothills: W side East Park Reservoir, ~0.3 mi S of boatlaunch, ~100 yds E of normal lake edge in muddy clay soil. (Gilmore Peak California: 10S -0541629E, 4355225N). 353 Comment
  JEPS120707  Cyperus erythrorhizos Lowell Ahart 2013-10-1 19078 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UC1100515  Cyperus erythrorhizos Herbert L. Mason and Verne Grant 1946-8-13 13012 Colusa 2 mi. w. Colusa (on Williams hwy. by gridge); Butte Sink Comment
  CAS-BOT-BC113934  Cyperus odoratus Malcom A. Nobs; Stanley Galen [S. Galen] Smith 1949-9-9 1871 Colusa Rice fields 3 miles west of Williams. Comment
  CHSC94790  Cyperus odoratus Lowell Ahart 2006-9-26 13356 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  POM313098  Cyperus odoratus H. L. Mason 1945-9-19 12721 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  CAS-BOT-BC113935  Cyperus odoratus Gordon H. True 1974-11-15 7839 Colusa On Delevan Road just W of Four Mile Road, 4 mi E of Delevan. 27 Comment
  CDA38904  Cyperus odoratus G. H. True 1974-11-15 7839 Colusa On Delevan Road just west of Four Mile Road, 4 miles east of Delevan. Comment
  CHSC91049  Cystopteris fragilis D. Isle 2003-6-9 361 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. In drainage that feeds Cedar Creek. 1447 Comment
  RSA714647  Dactylis glomerata Daisie Huang 2006-4-15 6041502 Colusa Maxwell rest stop on I-5. 25 Comment
  CAS-BOT-BC445508  Damasonium californicum A. A. Heller; H. E. Brown 1902-5-1 5437 Colusa Near Colusa Comment
  JEPS32214  Damasonium californicum W. L. Jepson 1934-5-3 16596 Colusa College City Comment
  POM208587  Damasonium californicum A. A. Heller, H. E. Brown 1902-5-1 519 Colusa Near Colusa. Comment
  UCD18854  Damasonium californicum Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 162 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  CAS-BOT-BC445505  Damasonium californicum J. Clausen 1935-5-20 1017 Colusa Ca. 27 mi. W. of Williams after passed the Wilbur Springs road. Along Bear Creek Comment
  POM208489  Damasonium californicum H. M. Hall 1916-8-10 10265 Colusa Sacramento Valley. Comment
  JEPS95650  Datisca glomerata Vernon H. Oswald and L. Ahart 1999-6-22 9787 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 30, ca. 1400 ft, chaparral, serpentine substrate. Herbaceous perennial ca. 1 m tall on the rocky bank of Little Stony Creek. 426 Comment
  CDA41123  Datura ferox F. F. Swim 1959-6-18 2919 Colusa 0 Comment
  UCD38811  Daucus pusillus Beecher Crampton 1958-5-19 4797 Colusa 10.1 miles southeast of Leesville. Comment
  UCD57059  Daucus pusillus Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3653 Colusa BLM Payne Ranch, mouth of Craig Canyon, along unimproved road, about 2 road miles south of junction of Hwy 20 and Hwy 16. . 316 Comment
  JEPS81345  Delphinium antoninum L. R. Heckard and J. C. Hickman 1982-7-7 5957 Colusa Middle Fork of South Fork of Stony Creek Snow Mt. (originating in Veratrom Meadow before Milk Ranch) 1935 Comment
  HSC86893  Delphinium hesperium Pat Daly, Rudy Galindo 1988-4-17 58 Colusa 5.2 mi. S of Bear Valley Rd. 390 Comment
  UCD57667  Delphinium hesperium Erica A. Smith; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, just west of where road crosses Craig Creek. 313 Comment
  HSC47510  Delphinium hesperium Sheila Logan 1978-4-21 52 Colusa N of Bear Valley Rd. Comment
  CAS-BOT-BC238187  Delphinium hesperium subsp. pallescens Roman Gaukin 1958-5-4 s.n. Colusa Bear Valley Comment
  CDA11416  Delphinium hesperium subsp. pallescens G. F. Hrusa, K. van Katwyk 1995-4-22 12137 Colusa Inner North Coast Ranges; Small colony on low slope in partial shade of Quercus douglasii on S side of Leesville Rd. approx. 3 m. N of Hwy 20, flowers light purplish to near white. Rather tall-to 3 ft., most individuals just beginning bloom. Comment
  CHSC76785  Delphinium hesperium subsp. pallescens Mary Ann Griggs 1999-5-13 Colusa Vicinity of Antelope Valley and Sites. 121 Comment
  CHSC80059  Delphinium hesperium subsp. pallescens L. P. Janeway; B. Castro 2000-5-4 6709 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 259 Comment
  CHSC86969  Delphinium hesperium subsp. pallescens B. Castro 2003-5-14 1434 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. 158 Comment
  UC1181387  Delphinium hesperium subsp. pallescens R. L. Taylor, H. G. Baker and L. Constance 1960-5-29 4421 Colusa n-facing slope 13 mi w Maxwell (on road to Lodega) Comment
  SEINET12091405  Delphinium uliginosum R. A. DeMartile 1983-1 109 Colusa Bartlett Springs Road N of Baldy Mt 762 Comment
  SFV1292  Delphinium variegatum B. J. McCaskill 1962-5-2 651 Colusa On road along Bear Creek from State Highway 20 north to Leesville. 3.6 miles north of Wilbur Springs turnoff. About 200 yards west of road. Comment
  UCD57830  Delphinium variegatum Gordon Harrington 2007-4-17 37 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 554 Comment
  UCR146707  Delphinium variegatum Roman Gankin 1958-5-4 s.n. Colusa Bear Valley 400 Comment
  RSA400057  Delphinium variegatum L. S. Rose 1936-4-27 36177 Colusa 10 miles NW of Rumsey. 213 Comment
  SEINET5718465 Image available Delphinium variegatum Robert A. Christison 1960-1 29 Colusa On State Hwy 16, ca. 3 miles from Yolo-Colusa county border. 183 Comment
  UCD14295  Delphinium variegatum R. Schulhof 1984-4-21 10 Colusa Colusa Co.; 9.8 miles north of Highway 20 on the east side Bear Valley Road; 381 Comment
  UCD14296  Delphinium variegatum G. Robinson 1984-4-21 13 Colusa Colusa Co.; Bear Valley; east of Wilbur Springs Road, 5.9 miles north of Highway 20, ca. 90 meters from road; 405 Comment
  UCD15287  Delphinium variegatum Claire Warshaw 1985-4-13 7 Colusa along Bear Valley Road, 8 miles norhtwest from intersection with highway 20; 390 Comment
  UCD23391  Delphinium variegatum Robert E. Rolley 1977-5-8 23 Colusa Erect perennial herb, 10-30 cm tall, roots shallow and woody, leaves mostly basal, some are red edged. Leaves and stems covered by many short hairs. Flowers deep purple, upper petal white edged, spurred. Valley grassland. Dry, sunny, flat field. 9.5 miles north on Bear Valley Road from Highway 20. Comment
  UCD96611  Delphinium variegatum Rolf Y. Berg 1963-3-17 s.n. Colusa State Highway 16 between Cache Creek Canyon and junction with State Highway 20. Comment
  UC71644  Delphinium variegatum subsp. variegatum Miss Alice King 1905-1 Colusa College City Comment
  UCD82458  Delphinium variegatum subsp. variegatum Craig Thomsen; G. Harrington 2009-5-12 2836 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  CAS-BOT-BC16954  Delphinium variegatum subsp. variegatum L. S. Rose 1936-4-27 36177 Colusa 10 mi. NW of Rumsey 213 Comment
  SEINET3927152  Deschampsia cespitosa Fred W. Hoffman 1944-7-13 1949 Colusa Between Indian and Bear valleys, western.; 0 Comment
  JEPS82284  Deschampsia cespitosa subsp. cespitosa Roger Raiche 1982-3-20 20245 Colusa Walker Ridge Comment
  CAS-BOT-BC192669  Deschampsia danthonioides L. R. Abrams 1928-5-8 12591 Colusa 2 miles south of Arbuckle Comment
  CAS-BOT-BC192672  Deschampsia danthonioides A. A. Heller 1902-5-1 5435 Colusa Near College City Comment
  CHSC107972  Deschampsia danthonioides B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1855 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. Towards north end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/marsh, in drying vernapool bottom. 49 Comment
  CHSC85968  Deschampsia danthonioides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 91 Comment
  HSC9599  Deschampsia danthonioides C. B. Wolf 1928-5-8 2127 Colusa 3 mi. S of Arbuckle Rd. on the Pacific Hwy. Comment
  JEPS75435  Deschampsia danthonioides W. L. Jepson 1934-5-3 16601 Colusa Stegeman sta. n. of Colusa Comment
  RSA10441  Deschampsia danthonioides C. B. Wolf 1928-5-8 2127 Colusa Sacramento Valley. 3 mi. south of Arbuckle Comment
  UCD163856  Deschampsia danthonioides Craig D. Thomsen 2001-4-26 2483 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  SEINET10524208  Deschampsia danthonioides A. Arthur Heller 1902-5-1 Heller 5435 Colusa Near College City. Comment
  SEINET10909286  Deschampsia danthonioides Roland McKee 1918-5-1 McKee s.n. Colusa Princeton. Comment
  JEPS75750  Deschampsia elongata L. R. Heckard and R. Bacigalupi 1976-9-6 4430 Colusa along trail from Summit Springs to Fouts Camp (Snow Mt.); Lake-Colusa Co. Line, Snow Mt. 1798 Comment
  JEPS81318  Descurainia sophia L. R. Heckard and J. C. Hickman 1982-7-6 5933 Colusa slope above and e Summit Springs (on s side of Snow Mt); Snow Mt. 1584 Comment
  CHSC48439  Dicentra chrysantha Vernon Oswald 1984-7-20 1609 Colusa M10, 11.3 mi w of Rd. 306 at Stonyford. 792 Comment
  UC725575  Dicentra chrysantha A. A. Heller 1940-6-5 15713 a Colusa e of Lodogo (near the foot of grade, on the Lodogo-Sites road) Comment
  CHSC110819  Dicentra chrysantha David Isle; Rhonda Isle 2013-5-19 2040 Colusa Mendocino National Forest - North Coast Ranges Little Stony Creek Watershed. 0.1 mi W of Maxwell Grade Summit; Burned NW asp. S of Sites Lodoga Road. 548 Comment
  CHSC58244  Dichelostemma capitatum subsp. capitatum Dave Read 1975-4-20 13 Colusa Bear Valley, 8.7 miles north of State Highway 20 on Bear Valley Road. 411 Comment
  UCD164037  Dichelostemma capitatum subsp. capitatum Amber Flores 2016-4-9 3 Colusa BLM Bear Creek Ranch (previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Area just southwest of corral at 16 and 20. 325 Comment
  RSA367472  Dichelostemma capitatum subsp. capitatum Thomas W. Nelson, Jane P. Nelson 1978-4-2 9532 Colusa Bear Valley Road, 3 miles from its junction with State Route 20. 366 Comment
  SD72213  Dichelostemma congestum Eugene Memmler 1969-5-8 105 Colusa Between Williams and Clear Lake, Highway 20. Coastal valley hills. 152 Comment
  CDA39450  Dichelostemma volubile T. C. Fuller 1958-5-27 3665 Colusa South of Highway 20, 1 mile west of junction with Highway 16. 0 Comment
  SEINET8476802  Dichelostemma volubile R. R. Halse 1989-5-7 3826 Colusa Along the Leesville Road, ca 3 miles SE of Leesville. 480 Comment
  UC1100288  Digitaria sanguinalis Herbert L. Mason 1945-9-19 12722 Colusa 1 mi n Colusa (below causeway over Butte Sink spillway); e bank of Sacramento River, Butte Sink spillway Comment
  RSA0114870  Distichlis spicata Lowell Ahart 2015-4-28 20116 Colusa North side of Maxwell-Colusa Road, about 5 1/2 miles east of Maxwell. 571 Comment
  SBBG119745  Distichlis spicata L. Ahart 2006-9-26 13353 Colusa N side of Maxwell Rd, between the deep ditch and the Delevan Nat Wildlife Refuge, ca. 3 mi W of Colusa Princeton Rd, ca. 5.5 mi E of Maxwell 24 Comment
  UCD18846  Distichlis spicata Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 154 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UC1613493  Dodecatheon hendersonii Charles M. Belshaw 1937-4-25 2852 Colusa Vicinity of Cook's Spring Devil's Ridge, Inner North Coast Range Comment
  UCD97119  Dodecatheon hendersonii Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6902 Colusa Along Brim Rd on east slope of Walker Ridge (Brim Rd becomes Bartlett Springs Rd). 438 Comment
  CHSC60673  Downingia insignis Vernon H. Oswald 1993-4-14 5264 Colusa N side of O'Hair Rd., just E of the headquarters buildings, Colusa National Wildlife Refuge, SW of Colusa. 18 Comment
  JEPS5039  Downingia insignis Alice King Apr 1906 Colusa College City Comment
  UCD55041  Downingia insignis Herbert L. Mason 1953-4-5 14506 Colusa Three miles east of Maxwell. Comment
  CHSC63534  Downingia ornatissima var. ornatissima Vernon H. Oswald; Joseph Silveira 1994-4-18 6110 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, on the SW side of Tract H. 21 Comment
  JEPS33725  Downingia pulchella D. E. Breedlove 1963-5-30 5191 Colusa 5 mi w Leesville Comment
  CAS-BOT-BC159697  Drymocallis glandulosa var. glandulosa H. H. Keifer 1928-5-2 s.n. Colusa North Peak, Marysville Buttes Comment
  UCD81726  Dudleya cymosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5729 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  CHSC112645  Dysphania botrys Lowell Ahart 2013-10-1 19087 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  SBBG119744  Dysphania botrys L. Ahart 2006-8-9 13119 Colusa N side and under bridge across Stony Crk, just N of Stonyford 347 Comment
  CHSC112622  Dysphania pumilio Lowell Ahart 2013-10-1 19086 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  CAS-BOT-BC197058  Echinochloa crus-galli Milo S. Baker 1944-7-18 10871 Colusa A few mi. W. of Williams along Highway to Lake Co. Comment
  SEINET241778 Image available Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 a Colusa 4.5 miles south of Grimes Comment
  UCD32928  Echinochloa crus-galli Beecher Crampton 1965-7-8 7448 Colusa Colusa County, 4.5 miles south of Grimes. Comment
  UCD34847  Echinochloa crus-galli Beecher Crampton 1963-9-9 6893 Colusa 1/4 mile E of Cortena. Comment
  UCD34845  Echinochloa crus-galli var. crus-galli Beecher Crampton 1963-9-9 6890 Colusa 1/4 mile E of Cortena. Comment
  UCD61073  Echinochloa muricata P. B. Kennedy 1925-9-18 Colusa Cortena. Comment
  CAS-BOT-BC197273  Echinochloa muricata var. microstachya Malcom A. Nobs; S. Galen Smith 1949-9-9 1874 Colusa 3 miles west of Williams Comment
  UCD34846  Echinochloa oryzicola Beecher Crampton 1963-9-9 6892 Colusa 1/4 mile E of Cortena. Comment
  UCD61107  Echinochloa oryzicola P. B. Kennedy 1925-9-18 Colusa Cortena. Comment
  UCD137955  Echinodorus berteroi June McCaskill; W. A. Harvey 1954-8-9 368 Colusa west side of pete Bartnett's house, Tule Road, around 7 miles east of Arbuckle. Comment
  UC1192122  Eclipta prostrata Herbert L. Mason and Verne Grant 1946-8-7 12985 Colusa 8 mi n Colusa; Butte Sink Comment
  HSC41911  Ehrendorferia chrysantha M. A. Baker 1977-4-24 224 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  HSC60471  Ehrendorferia chrysantha J. P. Smith 1977-4-24 9038 Colusa Along Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  UCD81617  Ehrendorferia chrysantha Collector Unknown 1950-6-1 s.n. Colusa Payne Range. Comment
  UC1101544  Elatine ambigua Malcolm A. Nobs and S. Galen Smith 1949-9-10 1892 Colusa 17 mi n Knights Landing (rice fields) Comment
  UC1245141  Elatine ambigua June McCaskill 1954-8-9 357 Colusa ca 2 mi e Princeton (300 yards s of Glenn Co. line) Comment
  UCD66936  Elatine rubella Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5085 -a Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  CHSC79857  Eleocharis macrostachya L. P. Janeway 2000-5-31 6776 Colusa Inner North Coast Ranges. At Candy Bucket Springs, on the south side of canyon of Stony Creek. 628 Comment
  SD225710  Eleocharis macrostachya Carol Witham, Jennifer Buck 2001-4-30 156 Colusa 2 miles south of the town of Clusa alng Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001 Comment
  UCD49729  Eleocharis montevidensis D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain between Lodoga and Red Rock Cabin. 420 Comment
  CDA38994  Eleocharis parishii L. P. Janeway 2000-5-31 6776 Colusa Inner North Coast Ranges; At Candy Bucket Springs, on the south side of canyon of Stony Creek. Comment
  SEINET13710358  Eleocharis parishii Lowell William Ahart, Lowell William Ahart 2003-1 10382 Colusa 21 Mi. SW of Williams (39 Deg 00'23.7"N, 122 Deg 23'59.5"W) 1708 Ft. 521 Comment
  UCD61458  Eleocharis parishii Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3904 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1 mile SW of parking lot. 390 Comment
  UCR198135  Eleocharis parishii Ellen Dean, Gordon Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3904 Colusa Payne Ranch (owned by BLM), lands to the southwest of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek, c. 1.0 mi southwest of parking lot 390 Comment
  SBBG83315  Elymus elymoides L. F. LaPre 1986-5-30 Colusa 1.5 mi W of Mendocino Nat Forest boundary on Stony Crk Rd; T18N, R7W, S34 670 Comment
  JEPS75852  Elymus elymoides subsp. elymoides L. R. Heckard 1974-9-10 3896 Colusa East Peak Snow Mt. (e slope) 2103 Comment
  CHSC91005  Elymus glaucus D. Isle 2002-6-28 177 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Below 4x4 Rd. 17N31 (Lovelady Ridge Jeep Rd.). 1060 Comment
  JEPS75758  Elymus glaucus subsp. glaucus L. R. Heckard and R. Bacigalupi 1976-9-6 4441 Colusa just e Fouts Camp; Snow Mtn. 1859 Comment
  UCD72393  Elymus glaucus subsp. glaucus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5119 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern part of ranch, upslope of confluence of Bear and Cache Creeks. Along old hunting camp road southeast (downslope) of junction with ridge trail. 384 Comment
  CAS-BOT-BC228537  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa Grade about 3 miles west of Leesville Comment
  UCD62448  Elymus multisetus D. Sanchez Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. 450 Comment
  UCD67001  Elymus multisetus Craig D. Thomsen 2008-5-23 2738 Colusa BLM Payne Ranch. 0.5 mile south of Hwy 20 (south of Destanella Flat), about 2.5 miles west of Hwy 16. 542 Comment
  POM146492  Elymus multisetus A. A. Heller 1916-6-6 12357 Colusa [No locality specified] Comment
  HSC48169  Emmenanthe penduliflora Thomas W. Nelson, Jane P. Nelson 1978-4-29 3933 Colusa Along Bear Valley Rd., 2 mi. from the junction with State Route 20. 366 Comment
  UC1609171  Emmenanthe penduliflora Vernon H. Oswald and Lowell Ahart 1993-5-27 5431 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 rd mi e of Lodoga) 481 Comment
  UCD170129  Emmenanthe penduliflora Jack Alderson 2016-5-1 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 2400 feet (730 m) west of the confluence of Brophy Creek with Bear Creek. 341 Comment
  CHSC94519  Epilobium brachycarpum Lowell Ahart 2006-8-22 13218 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD82133  Epilobium brachycarpum Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5663 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 861 Comment
  UC73325  Epilobium campestre Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD66863  Epilobium campestre Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5066 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond. 609 Comment
  CHSC113043  Epilobium ciliatum subsp. ciliatum Lowell Ahart 2013-10-1 19101 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS80784  Epilobium ciliatum subsp. ciliatum L. R. Heckard and J. C. Hickman 1981-7-30 5757 Colusa se side of mt. Snow Mt., Trout Creek 1600 Comment
  CHSC86819  Epilobium cleistogamum Jenny Marr; Heidi West, Caroline Warren 1998-7-1 Colusa Vicinity of Sites, Golden Gate, Stone Corral Creek, and Funks Creek. Vernal pools. 103 Comment
  JEPS80388  Epilobium densiflorum L. R. Heckard and J. Hickman 1981-6-22 5621 Colusa big meadow along creek Snow Mt., Dark Hollow Creek 1889 Comment
  SBBG119942  Epilobium densiflorum L. Ahart 2006-8-9 13140 Colusa N side and under the bridge across Stony Crk, just N of Stonyford 347 Comment
  UCD82627  Epilobium foliosum Craig Thomsen; G. Harrington 2009-5-12 2898 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  JEPS86627  Epilobium foliosum L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6709 Colusa 0.5 mi ne Summit Springs (sw flank of Snow Mountain, Colusa-Lake County line); Snow Mountain 1640 Comment
  CHSC115385  Epilobium minutum Lowell Ahart 2015-4-1 19998 Colusa Near a small drainage, burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  JEPS94775  Epilobium minutum Vernon Oswald and Lowell Ahart 1998-5-7 9005 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  POM256523  Epilobium minutum E. K. Crum 1938-5-8 2026 Colusa 3 miles north of Leesville. Comment
  CHSC101430  Epilobium nivium David Isle 1990-6-6 1527 Colusa On Lower Summit Valley Rock Outcrop W of Rd 17N10. 1682 Comment
  CHSC32221  Epilobium nivium James Jokerst 1980-8-6 1049 Colusa North Coast Ranges. Near Snow Mountain. 484 Comment
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Dec 23 2008
  CAS-BOT-BC58020  Equisetum Roxana S. Ferris 1926-4-21 6312 Colusa Near Sycamore. Comment
  JEPS110232  Equisetum arvense Lowell Ahart 2006-8-22 13211 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA724896  Equisetum laevigatum L. Ahart 2006-8-22 13210 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  CHSC94404  Eragrostis cilianensis Lowell Ahart 2006-8-9 13138 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  HSC97370  Eragrostis cilianensis J. P. Smith, J. O. Sawyer 2007-9-2 12418 Colusa River Rd. N of Colusa 20 Comment
  RSA0105552  Eragrostis hypnoides Lowell Ahart 2013-10-1 19077 Colusa Inner North Coast Range. East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  SEINET200142 Image available Eragrostis hypnoides Herbert L. Mason 1945-9-19 12717 Colusa Below causway over Butte Sink spillway east bank of Sacramento River 1 mile above Colusa Comment
  UCR261664  Eriastrum abramsii Ann Howald 2003-5-8 2333 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3.7 miles north of Lodoga, near Chisolm Cove Group Campground 380 Comment
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Dec 15 2016
  JEPS123252  Eriastrum tracyi David Gowen 2004-6-23 130 Colusa West of Stonyford near Fouts Springs. Toward the western edge of Davis Flat. Comment
  CHSC35579  Ericameria linearifolia J. P. Smith; Tom Nelson, Jane Nelson 1978-4-1 9527 Colusa Walker Ridge road, 3.2 miles from its junction with State Route 20. Comment
  HSC72122  Ericameria linearifolia J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 mi. from its junction with State Route 20. Comment
  SEINET4208167  Ericameria linearifolia Richard R. Halse 2013-3-26 8742 Colusa Along the Leesville-Logoda Road ca. 5.5 miles south of Logoda, or 3.2 miles north of the junction of the Leesville and Bear Valley Roads; Indian Valley.; 0 426 Comment
  UCD163349  Ericameria linearifolia Craig D. Thomsen 2000-5-12 2329 Colusa Walker Ridge. Along road to Elgin Mine. Comment
  UCR261620  Ericameria linearifolia Ann Howald 2003-3-25 2285 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near dam, west of Little Stony Creek 355 Comment
  UCR80265  Ericameria linearifolia J. P. Smith, Thomas Nelson, Jane Nelson 1978-4-1 9527 Colusa Walker Ridge Road, 3.2 mi. from its junction with State Route 20. Comment
  UCD84637  Erigeron greenei G. Harrington 2009-7-21 86 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones spring area on W side of road. Ca 6.5 road miles N of junction with Hwy 20. W side of road. 833 Comment
  CHSC92605  Erigeron inornatus var. inornatus D. Isle 2005-8-2 1159 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. West end of Board Camp Ridge. 1554 Comment
  JEPS80811  Erigeron petrophilus var. petrophilus L. R. Heckard and J. C. Hickman 1981-7-31 5784 Colusa e side Snow Mt. (rock promontory called Fouts Springs Overlook); , Fouts Springs Overlook 1798 Comment
  CAS-BOT-BC295954  Erigeron philadelphicus Roxana S. Ferris 1917-4-15 611 Colusa Sycamore Slough Comment
  CHSC77302  Erigeron sumatrensis Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  CAS-BOT-BC216004  Eriodictyon californicum L. Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony Creek 2.5 miles east of Bonnie View, Inner North Coast Ranges 518 Comment
  RSA23083  Eriodictyon californicum Lincoln Constance 1939-5-14 2488 Colusa Above Middle Fork of Stony creek 2.5 miles E of Bonnie View, Inner N Coast Ranges 518 Comment
  UC624291  Eriodictyon californicum L. Constance 1939-5-14 2488 Colusa 2.5 mi e of Bonnie View (above Middle Fork of Stony Creek, Inner North Coast Ranges); Inner North Coast Ranges 518 Comment
  UC71629  Eriodictyon californicum Miss Alice King 1905-1 Colusa College City Comment
  UCD58169  Eriodictyon californicum Gordon Harrington 2007-5-15 59 Colusa BLM Payne Ranch. Sandy north side of Cache Creek, about 1/2 mile upstream from the confluence of Cache Creek and Bear Creek. 190 Comment
  UCR196318  Eriodictyon californicum Mark A. Elvin, D. Isle, Mark S. Brunell 2006-8-3 4995 Colusa Northern Inner Coast Ranges, Mendocino National Forest, east face of Snow Mountain, Stony Creek along M10 610 Comment
  RSA60348  Eriodictyon californicum G. R. Campbell 1948-6-18 649 Colusa 2 miles south of Wilbur Springs. Comment
  HSC94132  Eriogonum dasyanthemum G. Fred Hrusa 1998-10-28 14904 Colusa Along summit of Walker Ridge 900 Comment
  JEPS110262  Eriogonum dasyanthemum Lowell Ahart 2006-6-11 12680 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  SBBG83903  Eriogonum dasyanthemum L. F. LaPre 1986-5-30 Colusa 1.5 mi W of Mendocino Nat Forest boundary on Stony Crk Rd; T18N, R7W, S34 670 Comment
  UC1736002  Eriogonum dasyanthemum Dean W. Taylor 1992-6-10 12693 Colusa Highway 162 Alder Springs Road, ca. 4 miles west from junction in Stony Creek valley 762 Comment
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Feb 23 2009
  CAS-BOT-BC242578  Eriogonum dasyanthemum A. J. Bassinger 1920-10-29 s.n. Colusa Sand Creek Comment
  RSA0115043  Eriogonum dasyanthemum Lyman Benson 1948-7-16 12922 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  RSA279686  Eriogonum dasyanthemum James L. Reveal 1975-7-27 3902 Colusa Along the Leesville Road west of Williams, on a steep road grade about 3.2 miles southeast of Leesville, and about 1 mile below the summit of the grade Comment
  RSA488801  Eriogonum dasyanthemum James L. Reveal 1988-6-2 6985 Colusa Walker Ridge Road along Lake County line, 3.3 miles north of the turnoff to Jordan Valley Dam and 0.2 mile south of the summit of the road, about 9 miles north of California Highway 20 and 7 miles south of the Bartlett Springs Road 1082 Comment
  CAS-BOT-BC250371  Eriogonum gracile Roxana Stinchfield 1916-6-18 307 Colusa Near College City Comment
  UCSB1430  Eriogonum gracile Keator, Glenn 1958-6-16 Colusa just east of Colusa-Lake County line; on road from Lower Lake to Sacramento Valley Comment
  UC1051504  Eriogonum hirtiflorum Helen K. Sharsmith 1953-6-19 4288 Colusa near Trough Springs (on Trough Springs Ridge); Inner North Coast Ranges, Mendocino National Forest, Trough 975 Comment
  RSA96804  Eriogonum luteolum Percy C. Everett, E. K. Balls 1954-10-17 20336 Colusa West slope Goat Mt., 0.9 mile SW from Linger Longer campsite; road from Stonyford to Upper Lake 1829 Comment
  JEPS75713  Eriogonum luteolum var. luteolum L. R. Heckard 1974-9-9 3838 Colusa Trail up from Summit Springs; Colusa-Lake County Line, Snow Mt. 1645 Comment
  UC1043546  Eriogonum luteolum var. luteolum P. C. Everett and E. K. Balls 1954-10-17 20336 Colusa 0.9 mi sw on road from Stonyford to Upper Lake Linger Longer campsite (w slope Goat Mt.); Goat Mt. 1828 Comment
  JEPS80338  Eriogonum nervulosum L. Heckard 1982-7-6 5951 Colusa West Peak ridge, Snow Mt. Snow Mt. 2103 Comment
  UCD100642  Eriogonum nudum var. nudum Arthur M. Shapiro 1988-8-24 s.n. Colusa near Glenn County Line, at Goat Mountain Lookout, just below summit of Goat Mountain. In Mendocino National Forest. 1865 Comment
  CDA1339  Eriogonum umbellatum var. bahiiforme D. Isle 2005-8-1 1155 Colusa 1/3 mi S of Goat Mountain Lookout. Comment
  UCD67054  Eriophyllum lanatum var. achilleoides Craig D. Thomsen 2008-5-31 2760 Colusa BLM Payne Ranch. Lands to the SW of Hwy 20/16 intersection. Along Hwy 16, ca. 1 mile south of Hwy 20. Near Cowboy Camp. 0.25 mile west of Bear Creek and public viewing area. 305 Comment
  UCR206381  Eriophyllum lanatum var. achilleoides George K. Helmkamp, E. A. Helmkamp 2009-5-20 14755 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  CAS-BOT-BC308100  Eriophyllum lanatum var. achilleoides Roxana S. Ferris 1926-4-23 6445 Colusa Near top of Grapevine Grade between Stonyford and Sites Comment
  SEINET10673292  Eriophyllum lanatum var. achilleoides Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 375 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  CHSC8130  Eriophyllum lanatum var. grandiflorum J. G. Moore 1969-4-12 64 Colusa North side of Hwy. 20 on hillside 15 mi. w of Williams. 106 Comment
  UCD163220  Erodium botrys Craig D. Thomsen 2000-4-28 2210 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.75 mile west of Hwy 20/16 intersection. 345 Comment
  UCD66935  Erodium brachycarpum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5085 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat. 628 Comment
  UC73402  Erodium macrophyllum Miss M. Alice King 1905-1 Colusa near Arbuckle (near College City, Sacramento Valley); Sacramento Valley Comment
  UC73462  Erodium macrophyllum Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCR238747  Erodium moschatum George K. Helmkamp, E. A. Helmkamp 2012-2-9 18536 Colusa Sacramento Valley, River Road, 7.1 miles north of Colusa; east side of Sacramento River 18 Comment
  CHSC91560  Eryngium aristulatum D. Isle 1995-7-12 397 Colusa Mendocino National Forest--North Coast Ranges. Bear Creek Watershed. BLM land S off Cook Springs. 548 Comment
  UCD82579  Eryngium aristulatum Craig Thomsen 2008-6-12 2769 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UC727670  Eryngium castrense Milo S. Baker 1946-9-4 11611 Colusa near locked gate of Colusa Gun Club Butte Sink Comment
  CDA24852  Erysimum capitatum G. D. Barbe, T. C. Fuller 1986-3-6 4260 Colusa Leesville Grade west of Williams. 0 Comment
  UCD163847  Erysimum capitatum Craig D. Thomsen 2000-5-30 2273 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  CHSC75599  Erysimum capitatum var. capitatum Vernon H. Oswald; Lowell Ahart 1999-6-22 9776 Colusa Lily Pond near Upper Letts Lake west of Stonyford. Adjacent to meadow at the Lily Pond. 1243 Comment
  HSC71302  Erysimum capitatum var. capitatum Thomas W. Nelson, Jane P. Nelson 1979-4-12 4624 Colusa Along Stony Creek below Digger Pine Campground Comment
  CHSC94464  Erythranthe floribunda Lowell Ahart 2006-8-9 13151 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC110048  Erythranthe microphylla Lowell Ahart 2013-5-1 18688 Colusa Inner North Coast Range. In a small drainage, north of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC84196  Erythranthe microphylla Lowell Ahart 2003-7-14 10383 Colusa Along a stream, field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  UCD82626  Eschscholzia caespitosa Craig Thomsen; G. Harrington 2009-5-12 2896 Colusa Colusa County on Walker Ridge: from spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  JEPS80217  Eschscholzia californica L. R. Heckard and J. Hickman 1980-7-3 5373 Colusa above Summit Springs (sw slope of mt.); Snow Mt. 1554 Comment
  UC630427  Eschscholzia californica Annetta Carter 1938-5-8 1392 Colusa 5.5 mi s Leesville (on Wilbur Springs rd); Inner North Coast Range, Bear Valley 426 Comment
  UCD70236  Eschscholzia californica D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Serpentine chaparral (Ceanotho albiflori-Quercetum duratae Sanchez-Mata, Barbour and Rodriguez in Rivas-Martinez 1997). 450 Comment
  CAS-BOT-BC402975  Eschscholzia californica Roxana Stinchfield 1916-7-12 473 Colusa College City Comment
  CAS-BOT-BC402978  Eschscholzia californica Roxana S. Ferris 1917-4-14 603 Colusa 3 mi west of Arbuckle, Arbuckle - Rumsey Road Comment
  CAS-BOT-BC5885  Eschscholzia californica Townsend Stith Brandegee 1889-4-1 s.n. Colusa unspecified Comment
  SEINET10871887  Eschscholzia californica David B. Dunn, Katherine L. Morris; Melvin L. Conrad 1973-6-6 Dunn 381 Colusa Chaparral woodland and sparse oaks; on hwy 20, .3 mi e of lake county line. Comment
  SDSU6059  Eucrypta chrysanthemifolia D. F Howe 1962-5-19 3284 Colusa 13 miles west of Williams on #2. 213 Comment
  CHSC115331  Euphorbia crenulata Lowell Ahart 2015-4-10 20011 Colusa In a small meadow, on the south side of Brim Road, about 2 miles west of the intersection of Bear Valley Road and Brim Road, about 17 miles (air) west of Williams. 500 Comment
  UCD66704  Euphorbia crenulata Craig D. Thomsen 2001-4-12 2454 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD66937  Euphorbia serpillifolia Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5086 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  UC73440  Euphorbia spathulata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Vally Comment
  UCD64248  Euphorbia spathulata Craig D. Thomsen 2000-3-31 2050 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD64283  Euphorbia spathulata Craig D. Thomsen 2000-3-31 2105 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82503  Euphorbia spathulata Craig Thomsen; G. Harrington 2009-5-12 2863 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  UCD82371  Euphorbia spathulata Robin McMaster 1973-4-15 344 Colusa 0.5 mi towards Bartlett Springs from Bear Valley Road. Comment
  UCD63021  Extriplex joaquinana Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4673 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the northwest of Eula Canyon and west of Cowboy Camp on the west side of Bear Creek. 451 Comment
  UCD82584  Extriplex joaquinana Craig Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-6-12 2764 Colusa Walker Ridge, near Elgin Mine on Lucientes property. 655 Comment
  CHSC110218  Festuca David Isle 1990-5-6 1983 Colusa Stony Creek watershed. Pendell Ranch abt 2 mi W of Co Rd 306 jct with Fouts springs Road; abt 150 yards south of Pendell home. 384 Comment
  JEPS120970  Festuca microstachys var. pauciflora Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18636 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  JEPS80773  Festuca roemeri L. R. Heckard and J. C. Hickman 1981-7-30 5746 Colusa se side Snow Mt. (Trout Creek Trail) 1661 Comment
  CAS-BOT-BC77677  Ficus carica J. H. Thomas 1960-8-30 8867 Colusa Edge of College City Comment
  CAS-BOT-BC63013  Frangula californica subsp. crassifolia A. A. Heller 1916-6-6 12360 Colusa Coast Range on the grade about 3 mi. w. of Leesville. Comment
  CAS-BOT-BC63014  Frangula californica subsp. crassifolia A. A. Heller 1916-6-6 12359 Colusa Coast Range on the grade about 3 mi. w. of Leesville. Comment
  CAS-BOT-BC62916  Frangula californica subsp. tomentella Roxana Stinchfield 1916-7-10 478 Colusa Oak Grove - Phillip's Ranch. Comment
  CAS-BOT-BC62918  Frangula californica subsp. tomentella C. Hart Merriam 1919-9-15 s.n. Colusa Stony Ford, nw. Colusa Co. Comment
  HSC48172  Frangula californica subsp. tomentella Thomas W. Nelson, Jane P. Nelson 1978-4-29 3936 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UCD55463  Frangula californica subsp. tomentella Ellen Dean; Gordon Harrington 2006-10-6 3287 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  CHSC50803  Frankenia salina Vernon Oswald 1990-7-3 4411 Colusa Four Mile Rd ca. 4.5 mi n of Maxwell-Colusa Rd, ca. 6 mi (air) northeast of Maxwell. Along the edge of the road. 27 Comment
  POM135669  Frankenia salina Roxana Stinchfield 1916-6-17 282 Colusa At Tule, College City. Comment
  CHSC36175  Fraxinus dipetala Robert A. Schlising 1978-4-10 3218 Colusa Grapevine Pass, on Sites--Lodoga Road. 562 Comment
  UCD15699  Fraxinus dipetala Sook Hong 1989-4-8 7 Colusa Bear Valley. 670 Comment
  UCD163233  Fraxinus dipetala Craig D. Thomsen 2000-4-12 2156 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 1 mile west of Hwy 20/16 intersection. 345 Comment
  UC1613366  Fritillaria Charles M. Belshaw April 1937 2863 Colusa vicinity of Cook's Spring (Devil's Ridge); Devil's Ridge Comment
  UCSC010486  Fritillaria affinis Dylan M. Neubauer, Tim Forsell 2016-3-31 598 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  CAS-BOT-BC130437  Fritillaria pluriflora Arthur Menzies; Barbara Menzies 1968-3-22 s.n. Colusa Bear Valley (Between Wilbur Springs & Leesville) Comment
  CHSC26609  Fritillaria pluriflora D. W. Isle 1978-3-3 1501 Colusa Stonyford Cemetary Lane ca. 1.5 mi w of Stonyford, s of Fouts Springs Road. 365 Comment
  CHSC79623  Fritillaria pluriflora Simona Altman 1999-4-3 52 Colusa Bear Valley, Bear Valley Rd. 396 Comment
  JEPS100638  Fritillaria pluriflora Dean W. Taylor 1992-3-18 13307 Colusa 1.6 mi S of Stonyford (on road to East Park Reservoir, on NE-facing slope W from the road) 365 Comment
Read comments
Jan 26 2011
  JEPS89227  Fritillaria pluriflora W. Roderick 1964-3-22 Colusa 1/2 mi e of summit of Lake County Line (on Highway 20 (Williams-Clear Lake)); Highway 20 (Williams-Clear Lake) 304 Comment
  UCR261615  Fritillaria pluriflora Ann Howald 2003-3-11 2276 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, peninsula c. 2 miles north of Lodoga 365 Comment
  UCSB24339  Fritillaria pluriflora Roderick, Wayne 1966-3-26 Colusa Bear Valley, beside Bartlett Springs Road, 1/2 mile east of Robbers Flat Comment
  JEPS15271  Fritillaria purdyi Rimo Bacigalupi with G. L. Stebbins, C. McMillan and Peter Kamb 1950-4-16 3107 Colusa between and above confluence of the North and Middle Forks of Stony Creek, very close to Glenn Co. line, above and n of Red Bridge Camp [Mend. Nat. Forest] Stony Creek; innermost ridges of Inner North Coast Ranges 579 Comment
  UCSC010483  Fritillaria purdyi Dylan M. Neubauer, Tim Forsell 2016-3-31 599 Colusa (NCoRI) Walker Ridge, Walker Ridge Road, 1.96 air-miles sse Cold Spring Mountain 820 Comment
  JEPS95487  Galium aparine Vernon H. Oswald and L. Ahart 1994-4-6 6062 Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford 469 Comment
  UCD64437  Galium aparine Craig D. Thomsen 2000-3-31 2070 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD82724  Galium aparine Craig Thomsen; G. Harrington 2009-5-14 2907 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 813 Comment
  CDA14919  Galium bolanderi G. F. Hrusa 1993-5-2 10860 Colusa North Coast Ranges; Frenzel Creek Research Natural Area. Mendocino National Forest. Mid-canyon of Frenzel Creek. Comment
  JEPS75835  Galium bolanderi L. R. Heckard 1974-9-11 3952 Colusa along Summit Springs trail Snow Mt. 1798 Comment
  JEPS80809  Galium bolanderi L. R. Heckard and J. C. Hickman 1981-7-31 5781 Colusa rocky promontory called Fouts Spring Overlook Snow Mt. (e side of mt) 1783 Comment
  OBI78460  Galium bolanderi Helen K. Sharsmith & Francia Chisaki, Francia Chisaki 1959-5-27 1335 Colusa At Mill Crk crossing on rd leading out of Red Bridge Camp Comment
  JEPS81405  Galium grayanum L. R. Heckard and J. C. Hickman 1982-7-9 6012 Colusa just e lookout (Colusa-Lake Co. boundary); Goat Mt. 1859 Comment
  JEPS27422  Galium grayanum var. nanum Peter H. Raven and Richard Snow 1959-9-11 14411 Colusa s shoulder Snow Mountain (w-facing scree slope) 2042 Comment
  RSA725011  Galium parisiense L. Ahart 2006-8-9 13149 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
Read comments
Aug 9 2017
  UC1177932  Galium parisiense Francia Chisaki and Gene B. Newcomb 1958-6-19 1134 Colusa about 3 mi w Stonyford (along path leading to dam); Diversion Dam Camp Comment
  UCD66950  Galium parisiense Ellen Dean; Davis Botanical Society 2008-5-31 4995 Colusa west of I-5 at Maxwell, along Goat Mountain Road, immediately west of the junction with Lodoga-Stonyford Road. 382 Comment
  SEINET11117450  Galium parisiense Unknown 1959-1 s.n. Colusa At Mill Creek crossing on road leading out of Red Bridge Camp, Colusa County. Comment
  UCD163913  Galium porrigens var. porrigens Sara Martin 2016-4-9 5 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Hill to the south of corral at junction of 16 and 20. 464 Comment
  UCD81242  Galium porrigens var. tenue Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5406 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  CDA42204  Galium trifidum var. pacificum G. D. Barbe, Daryl Brown 1982-7-2 3891 Colusa Mill Valley Campground, Lower Letts Lake, Mendocino National Forest. Comment
  CAS-BOT-BC199031  Garrya congdonii C. Hart Merriam 1907-7-23 s.n. Colusa Cook Spgs. Comment
  CDA12373  Garrya congdonii G. F. Hrusa 1996-1-2 12626 Colusa Inner North Coast Ranges; N side of Little Stony Creek, about 2 miles W of intersection of Cedar Camp Rd. and Stonyford-Lodoga Rd. Comment
  SBBG34146  Garrya congdonii R. D. Slayback 1959-3-20 2 Colusa near St Hwy 16, 6 mi NW of Rumsey Comment
  UCD121087  Garrya congdonii Frederic Hrusa 1989-2-7 5806 Colusa 2 miles off Stonyford-Lodoga Rd. up road to Cedar Mtn. Comment
  UCD121094  Garrya congdonii D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 450 Comment
  CHSC85961  Gastridium phleoides Jenny Marr; Heidi West, Joyce Lacey-Rickert, Caroline Warren 1998-5-8 Colusa Vicinity of Sites and Antelope Valley. 106 Comment
  UCD66545  Gastridium phleoides Beecher Crampton 1958-5-19 4796 Colusa 10.1 miles southeast of Leesville. Comment
  UCD164160  Geranium dissectum Craig Thomsen 2000-4-28 2268 Colusa Between Bear Creek and Bear Valley Rd. about 0.3 mile north of junction with Hwy 20. Comment
  UCD82816  Geranium dissectum Craig Thomsen; G. Harrington 2009-5-12 2890 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  CHSC75627  Geum macrophyllum Vernon H. Oswald; Lowell Ahart 1999-6-22 9781 Colusa Lily Pond near Upper Letts Lake west of Stonyford. Along the edge of the meadow at Lily Pond. 1243 Comment
  JEPS95997  Geum macrophyllum Vernon H. Oswald and Lowell Ahart 1999-6-22 9781 Colusa W of Stonyford ( Lily Pond near Upper Letts Lake) Comment
  CHSC79788  Gilia capitata G. F. Hrusa 1998-6-19 14611 Colusa Above upper Little Stony Creek. Goat Mtn. Rd. ~ 1.5 km. W of campground. UTM: 10S, 05356N, 43478E. 485 Comment
  UCD111675  Gilia capitata Christopher Mallek 2008-1 s.n. Colusa Frenzel Creek. 654 Comment
  RSA0014386  Gilia capitata Joan Stewart 1998-6-10 757 Colusa Bear Valley Comment
  CHSC112231  Gilia capitata subsp. capitata Lowell Ahart 2013-5-1 18663 Colusa On the east side of Bear Valley Road, about 2 1/2 miles (by road) northwest of the intersection of State Highway 20 and Bear Valley Road. 533 Comment
  JEPS108813  Gilia capitata subsp. capitata Lowell Ahart 2006-6-11 12676 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  UC73637  Gilia clivorum Miss M. Alice King 1905-1 Colusa near College City (Sacramento Valley); , near College City Comment
  CHSC14016  Gilia tricolor G. Notch 1974-3-30 120 Colusa Ca. 0.5 mi w of jct of Hwys 20 and 16. 304 Comment
  HSC45725  Gilia tricolor Patricia Shesgreen 1978-4-22 49 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC45794  Gilia tricolor J. P. Smith, Thomas W. Nelson 1976-4-14 8581 Colusa Mendocino National Forest, confluence of Stony Creek and N Fork of Stony Creek. 427 Comment
  POM163453  Gilia tricolor Roxana S. Ferris 1926-4-23 6403 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  POM282251  Gilia tricolor Lyman Benson 1929-3-26 1043 Colusa Wilbur Springs Comment
  CHSC112236  Gilia tricolor subsp. diffusa Lowell Ahart 2013-5-1 18684 Colusa Inner North Coast Ranges. Near a small drainage, north of the of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC59999  Gilia tricolor subsp. tricolor Carole Pauls 1975-4-20 1 Colusa Pasture. Bear Valley Road, 8.7 miles north of State Highway 20. Comment
  UC72069  Gilia tricolor subsp. tricolor Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley, near College City Comment
  UC71621  Githopsis specularioides Miss Alice King 1905-1 Colusa College City Comment
  POM312385  Glinus lotoides H. L. Mason 1945-7-11 12641 Colusa Near Butte creek; Butte Lodge Outing Club, 3 miles above Colusa. Comment
  UC1191378  Glinus lotoides Herbert L. Mason 1945-7-11 12641 Colusa 3 mi above Colusa (near Butte Creek, Butte Lodge Outing Club); Butte Lodge Outing Club Comment
  CAS-BOT-BC434996  Glinus lotoides Roxana Stinchfield 1916-7-9 425 Colusa Along Sacramento River, Phillips Ranch near Sycamore. Comment
  JEPS75872  Glyceria elata L. R. Heckard 1974-9-9 3874 Colusa se of Foutch Camp (just ne of rock promontory); Snow Mt. 1920 Comment
  CHSC77335  Glycyrrhiza lepidota Heidi West; Joyce Lacey-Rickert 1998-10-29 Colusa Vicinity of Antelope Valley and Sites. 109 Comment
  JEPS80185  Gnaphalium palustre L. R. Heckard with J. Hickman 1980-7-3 5337 Colusa just w of Summit Springs (sw of Snow Mt. (ca. 10 mi w of Stonyford), Colusa-Lake County boundary) 1548 Comment
  POM53845  Grindelia camporum Roxana Stinchfield 1916-6-17 283 Colusa Near Tule - College City. Comment
  POM53847  Grindelia camporum Roxana Stinchfield 1916-7-11 455 Colusa Willaims Road at the 'Trough' Comment
  RSA724829  Grindelia camporum L. Ahart 2006-9-26 13345 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5.5 miles east of Maxwell. 24 Comment
  UCD58174  Grindelia camporum var. camporum Gordon Harrington 2007-5-31 66 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 3/4 mile downstream from Road Kill Cafe. 357 Comment
  CHSC97316  Grindelia hirsutula var. davyi L. P. Janeway 2007-6-17 9059 Colusa Inner North Coast Ranges. Along Bear Valley Road and Bear Creek near Hwy 20. 325 Comment
  UCD36223  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. Comment
  UCD37233  Hainardia cylindrica Beecher Crampton 1958-6-27 4988 Colusa Colusa County, 3.5 miles south of Colusa. Comment
  UCD85141  Hainardia cylindrica Beecher Crampton 1953-4-29 1143 A Colusa Colusa County, 2 miles east of Maxwell. Comment
  UCD135766  Harmonia hallii Bruce G. Baldwin 1986-4-13 599 Colusa 2.6 miles west of junction with Bear Valley Road along Bartlett Springs Road. Comment
  CHSC32204  Hazardia whitneyi var. discoidea James Jokerst 1980-8-7 1068 Colusa North Coast Ranges. Near Snow Mountain (west). Comment
  CHSC106249  Helenium bigelovii B. Castro; L. P. Janeway 2001-6-3 1258 Colusa Inner North Coast Ranges. Spring at Grapevine flat, on top of Walker Ridge about 0.5 mi E of Baldy Mountain. East-facing slope/bench with large springy/meadowy area. 882 Comment
  UCD70304  Helenium puberulum D. Sanchez-Mata 1998-7-10 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. 420 Comment
  CAS-BOT-BC309382  Helenium puberulum Volney Rattan 1877-6-26 s.n. Colusa Sulphur Creek Comment
  CHSC94313  Helianthus bolanderi Lowell Ahart 2006-8-9 13097 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  RSA7606  Helianthus bolanderi C. B. Wolf 1955-6-25 5505 Colusa West side of Bear Valley, near mitchell Ranch House. Inner north coast Range. Upper Sonoran Digger River 305 Comment
  CHSC107283  Helminthotheca echioides L. P. Janeway; B. Castro 2011-7-9 10507 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.5 km southeast of Funks Reservoir and 0.1-0.6 km northeast of Te-hama-Colusa Canal. 50 Comment
  JEPS12555  Hemizonia congesta subsp. clevelandii R. F. Hoover 1938-6-11 3596 Colusa Williams-Lake Co. hwy at junction Wilbur Sprs. road Comment
  JEPS68350  Hemizonia congesta subsp. clevelandii L. R. Heckard with R. Bacigalupi and B. Doren 1971-9-9 2790 Colusa on Ladoga road about 3 mi s Stonyford 335 Comment
  SD133786  Hemizonia congesta subsp. clevelandii L. R. Heckard, J. C. Hickman 1980-9-15 5418 Colusa Slopes west of Summit Springs, Snow Mountain. 1555 Comment
  RSA0115040  Hemizonia congesta subsp. clevelandii Lyman Benson 1948-7-16 12923 Colusa Road between Williams and Clear Lake just east of Lake Co. line. Mt. Range: Inner North Coast. 548 Comment
  SEINET10797452  Hemizonia congesta subsp. clevelandii Katherine L. Morris, Melvin L. Conrad; David B. Dunn 1973-6-6 Morris 382 Colusa Chaparral woodland and sparse oaks; on Hwy. 20, 0.3 mi. E of Lake County line. Comment
  CHSC61405  Hemizonia congesta subsp. luzulifolia Vernon H. Oswald 1993-8-16 5808 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, N end of E edge of Tract 41. Also in the south portion of the refuge. 25 Comment
  CAS-BOT-BC309736  Hemizonia congesta subsp. luzulifolia Bruce G. Baldwin 1985-6-1 477 Colusa 0.7 mile north of California State Highway 20 on Bear Valley Road Comment
  CDA7037  Hemizonia congesta subsp. luzulifolia T. C. Fuller 1958-5-27 3687 Colusa Highway 20, 0.7 mile west of junction with Hwy 16. 0 Comment
  UCR281726  Hemizonia congesta subsp. tracyi David Isle, Frank Pendell 2014-6-16 2136 Colusa North Coast Range, c. 2 miles west of Stonyford on the Pendell Ranch, southeast of the home of Frank and Sheri Pendell c. 0.25 mile and northwest of the Stonyford Cemetary, c. 200 yards 384 Comment
  CHSC79092  Hesperevax caulescens B. Castro; C. Warren 2000-4-3 1045 Colusa Vicinity of Antelope Valley, Sites-Lodoga Rd, and Grapevine Ck. 164 Comment
  CHSC86871  Hesperevax caulescens B. Castro; Beth Hendrickson 2003-4-7 1415 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. 184 Comment
  UCR261648  Hesperevax caulescens Ann Howald 2003-4-23 2314 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, east of Coppermine Road, c. 1.1 mi north of intersection with East Ruby King Road 403 Comment
  UCD82619  Hesperolinon Craig Thomsen; G. Harrington 2009-5-12 2887 b Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 710 Comment
  CAS-BOT-BC175981  Hesperolinon californicum A. A. Heller 1916-6-6 12352 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  JEPS122821  Hesperolinon californicum W. A. Freyman with A. C. Schneider & Y. P. Springer 2014-5-20 288 Colusa Along north side of Goat Mountain Road west of Lodoga. Comment
  JEPS32277  Hesperolinon californicum W. L. Jepson 1938-6-11 18988 Colusa on creek 4 mi se Wilbur Springs (sw Colusa Co.); Bear Creek Comment
  UC1212442  Hesperolinon californicum Herbert L. Mason 1946-5-31 12815 Colusa 1 mi e Lake County line (Bartlett Springs to Williams road, western Colusa County); Inner North Coast Ranges Comment
  UCD110497  Hesperolinon californicum D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UCD63917  Hesperolinon californicum Craig D. Thomsen 2001-5-24 2506 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection (between Colusa Co. mileposts 2.17 and 2.25). 342 Comment
  UCR200666  Hesperolinon californicum Craig D. Thomsen 2008-5-31 2759 Colusa BLM Payne Ranch, southwest of intersection between Hwy 16 and Hwy 20, Cowboy Camp farea on the west side of Hwy 16, 1 mile south of Hwy 20, 0.25 mi. west of public viewing area and Bear Creek Comment
  CDA28487  Hesperolinon californicum T. C. Fuller 1958-5-27 3686 Colusa Highway 20, 0.7 mile west of junction with Hwy 16. 0 Comment
  UCD110514  Hesperolinon didymocarpum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  CHSC112217  Hesperolinon disjunctum Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18635 Colusa Inner North Coast Range. On the north side of State Highway 20, just east of Lake County Line, 12.2 mile (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC83165  Hesperolinon disjunctum Beecher Crampton 1995-6-4 10323 Colusa Colusa-Lake County Border: State Highway 20. Comment
  JEPS11966  Hesperolinon disjunctum Rimo Bacigalupi with G. T. Robbins 1954-6-25 4622 Colusa 0.1 mi e Lake County line (e of summit of road from Bear Valley to Indian Valley) 640 Comment
  JEPS120982  Hesperolinon disjunctum Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18635 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  UC1088845 Image available Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4253 Colusa ca. 1 mi above Diversion Dam of Big Stoney Creek (near road from Stoneyford to Fouts Springs); Mendocino National Forest; Mendocino National Forest, Colusa Co. 518 Comment
  UC1212486  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-17 4249 Colusa one mi beyond origin of Wilbur Springs road from State Hwy 20 Inner North Coast Ranges, Bear Creek drainage 335 Comment
  UC1212491  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4255 Colusa road between Fouts Springs and Stoneyford; Inner North Coast Ranges, Mendocino National Forest, Candy B 609 Comment
  UC1212492  Hesperolinon disjunctum Helen K. Sharsmith 1953-6-18 4254 Colusa on spur road one mi beyond Wolf Glade; Inner North Coast Ranges, Mendocino National Forest, drainag 609 Comment
  UC1212498  Hesperolinon disjunctum Helen K. Sharsmith 1951-7-13 4033 Colusa on Bartlett Springs road 4.4 mi from Leesville (western margin of county); Inner North Coast Ranges 609 Comment
  UC1509756  Hesperolinon disjunctum C. M. Rogers 1972-7-5 13423 Colusa along Route 20 at Colusa-Lake County line Comment
  UCR148797  Hesperolinon disjunctum Daniel Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley, Bear Valley Road, Bear Valley Creek 372 Comment
  SBBG128806  Hesperolinon disjunctum L. Ahart, J. Dittes, J. Guardino 2013-4-26 18635 Colusa rocky serpentine outcrop on N side of St Hwy 20, just E of Lake County Line, 12.2 mi (air) ENE of Clear Lake (town), 17.1 mi (air) W of Williams 566 Comment
  JEPS122820  Hesperolinon drymarioides W. A. Freyman with A. C. Schneider & Y. P. Springer 2014-5-20 289 Colusa 200 feet up slope from end of Cook Springs Road west off of Leesville Lodoga Road south of Lodoga. Comment
  SD8554  Hesperolinon drymarioides Katherine Curran Aug 1884 Colusa Epperson's Comment
  UC1212301  Hesperolinon drymarioides Helen K. Sharsmith 1953-7-1 4407 Colusa serpentine slope on n side canyon directly adjacent to Cook Springs (at end of road, ca five mi sw of Ladoga by road); Inner North Coast Ranges Comment
  UCD110523  Hesperolinon drymarioides Helen K. Sharsmith 1952-6-21 4159 Colusa North canyon slope overlooking Cook Springs. 548 Comment
  UCR71415  Hesperolinon drymarioides H. K. Sharsmith 1965-6-23 5528 Colusa Inner North Coast Ranges, N canyon slope overlooking Cook Springs 549 Comment
  UCD163331  Hesperolinon micranthum Craig D. Thomsen 2009-5-3 2800 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., about 0.5 miles north of Hwy 20. Comment
  RSA0089768  Heteranthera dubia Dean Wm. Taylor 2014-5-18 21476 Colusa 3.5 miles southwest of Maxwell; eastern bank of the Glenn-Colusa Canal downstream of the crossing of Fairview Road. 35 Comment
  JEPS108816  Heterocodon rariflorum Lowell Ahart 2006-6-11 12678 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  JEPS73775  Heuchera micrantha var. pacifica L. R. Heckard 1972-7-10 3126 Colusa 3 mi nw Fouts Springs (on se corner of Snow Mt.); Snow Mt 1828 Comment
  JEPS81347  Heuchera micrantha var. pacifica L. R. Heckard and J. C. Hickman 1982-7-7 5958 Colusa nw side Snow Mt (Crooked Tree Ridge) 1935 Comment
  JEPS15028  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa Butte Sink, near gate of Colusa Gun Club Comment
  UC914092  Hibiscus lasiocarpos Milo S. Baker 1946-9-4 11608 Colusa near locked gate of Colusa Gun Club Butte Sink Comment
  CDA38628  Hibiscus trionum Ken Flagor 2012-8-28 PDR# 060 P089080 Colusa North of Maxwell; north of Lenahan Road, south of Delevan Road, west of Sutton Road, east of McDermott Road. 0 Comment
  UCD72479  Hirschfeldia incana Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3813 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, across from BLM parking lot that is located at south end of bridge. 249 Comment
  CAS-BOT-BC320321  Holocarpha virgata A. A. Heller 1940-6-7 15721 Colusa Near the foot of the grade east of Lodogo on the Sites road Comment
  CDA20339  Holocarpha virgata D. Brown 2001-10-17 PDR 024366 Colusa Northern California; Vicinity of Colusa 0 Comment
  SEINET10758259  Holocarpha virgata subsp. virgata Andrew Townesmith, Karen M. Meyer 2007-8-7 Townesmith 907 Colusa Mendocino National Forest, Grindstone Ranger District. Vicinity of Wolf Creek OHV staging area, off Forest Service route M10, 4.2 miles west of intersection with Lodoga-Stonyford road in Stonyford. T18N R7W. 452 Comment
  UC1563895  Holocarpha virgata subsp. virgata Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8875 Colusa near East Park Road from Stonyford (nw side of East Park Reservoir); East Park Reservoir 365 Comment
  UC725605  Holocarpha virgata subsp. virgata A. A. Heller 1940-6-7 15721 Colusa road to Sites; Lodogo Comment
  UC194239  Holocarpha virgata subsp. virgata H. M. Hall 1916-8-16 10270 Colusa near Arbuckle Comment
  CAS-BOT-BC152577  Holodiscus discolor var. discolor A. A. Heller 1916-6-6 12362 Colusa Coast Range on the grade about 3 miels west of Leesville Comment
  UCD70230  Hordeum brachyantherum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. Perennial plant communities close to serpentine temporal vernal pools. 370 Comment
  UCD85417  Hordeum brachyantherum D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  CHSC107983  Hordeum brachyantherum subsp. brachyantherum B. Castro; L. Janeway 2011-4-27 1864 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 1 mi southeast of Funks Reservoir and 800 ft northeast of Tehama-Colusa Canal. Around edges of alkaline flat off northwest corner of large +/- alkaline marsh. 49 Comment
  JEPS475  Hordeum brachyantherum subsp. californicum W. L. Jepson 1938-6-9 18956 Colusa w slope of mountains between Indian Valley, Lake County and Bear Valley, Colusa County; Indian Valley, Bear Valley 579 Comment
  UCD163711  Hordeum depressum Craig Thomsen 1999-5-10 2023 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  CHSC53989  Hordeum jubatum Vernon H. Oswald 1991-4-21 4526 Colusa Four Mile Rd, 1.9 mi north of Maxwell Colusa Rd. Roadside ditches in area of rice fields. 27 Comment
  UCD66868  Hordeum marinum subsp. gussoneanum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5071 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Northwest corner of ranch. Along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond. 609 Comment
  SEINET3271561 Image available Hordeum murinum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14371 Colusa Inner North Coast Range Foothills; along CA-20, 14.3 miles southwest of Williams 375 Comment
  UCR206396  Hordeum murinum George K. Helmkamp, E. A. Helmkamp 2009-3-11 14371 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  CHSC83698  Hordeum murinum subsp. leporinum L. P. Janeway 2002-4-24 7521 Colusa Sacramento Valley/Inner North Coast Ranges border. Vicinity of Logan Ridge, Stone Corral Creek, and Funks Creek. 103 Comment
  JEPS80220  Hordeum murinum subsp. leporinum L. R. Heckard and J. Hickman 1980-7-3 5376 Colusa w Summit Springs (sw slope Snow Mountain); sw slope Snow Mountain 1554 Comment
  UCD86153  Hordeum murinum subsp. leporinum Beecher Crampton 1962-4-17 6214 Colusa Sycamore. Comment
  UCD86536  Hordeum vulgare Beecher Crampton 1962-4-17 6216 Colusa Sycamore. Comment
  CHSC48848  Horkelia californica subsp. dissita Vernon Oswald 1984-7-20 1614 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. On the edge of a meadow. 1280 Comment
  JEPS81278  Horkelia californica subsp. dissita L. R. Heckard and J. C. Hickman 1982-7-5 5889 Colusa south side of Snow Mt., Slope below (sout of) area Snow Mt., Summit Springs 1500 Comment
  CAS-BOT-BC383133  Horkelia tenuiloba Andrew Townesmith; Karen M. Meyer 2007-8-7 915 Colusa Mendocino National Forest, Grindstone Ranger District. Lily Pond, off Forest Service road 17N02, 1.7 miles SW of intersection with Forest Service route M10 1264 Comment
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Aug 17 2018
  JEPS80445  Hypericum formosum var. scouleri L. R. Heckard and J. C. Hickman 1980-9-15 5422 A Colusa w. of Summit Springs (Snow Mt.); Snow Mt. 1554 Comment
  JEPS80769  Hypericum formosum var. scouleri L. R. Heckard and J. C. Hickman 1981-7-30 5737 Colusa s.e. side Snow Mt. (along Trout Creek trail) 1676 Comment
  SEINET255491  Hypochaeris glabra Richard R. Halse 2007-3-25 7122 Colusa Along State Hwy. 20 ca. 7.8 miles northeast of its junction with State Hwy. 16, at base of Salt Canyon. 100 Comment
  CDA15768  Iris macrosiphon G. F. Hrusa 1993-5-2 10853 Colusa North Coast Ranges; Frenzel Creek Research Natural Area - Mendocino National Forest. Lower Frenzel Creek, tributary of Little Stony Creek. Comment
  UCD58172  Iva axillaris Gordon Harrington 2007-5-31 62 Colusa BLM Payne Ranch. Lands to the SW of the intersection of Hwy 16 and Hwy 20. Along Thompson Creek, approximately 1 mile downstream from Road Kill Cafe. 336 Comment
  JEPS80274  Juncus balticus L. R. Heckard, and J. Hickman 1980-9-16 5460 Colusa nw slope West Peak (cirque area between peaks, Snow Mt.); Snow Mt., West Peak 2011 Comment
  UCD65641  Juncus balticus Craig D. Thomsen 2000-4-28 2178 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, on south side of Hwy 20, ca. 0.25 mile west of Hwy 20/16 instersection, near Colusa Co. milepost 3.00. 310 Comment
  CHSC107173  Juncus balticus subsp. ater L. P. Janeway; B. Castro 2011-5-19 10284 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; 1.8 km southeast of Funks Reservoir and 0.2 km northeast of Tehama-Colusa Canal. Large +- alkaline vernal pool/marsh; mucky clay soil. Eastern of the 2 Juncus patches at the south edge of the marsh, just above high water line. 50 Comment
  JEPS121120  Juncus bufonius var. bufonius Lowell Ahart 2013-5-1 18691 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  CHSC86963  Juncus bufonius var. congestus B. Castro; Michelle Cedarborg 2003-5-1 1425 Colusa Vicinity of Logan Ridge, Sites Peak and Lurline Creek. In wet mud just downstream of pond at creek headwaters. 205 Comment
  JEPS75719  Juncus ensifolius L. R. Heckard 1974-9-9 3850 Colusa just se Foutch Camp; Snow Mt. 1889 Comment
  JEPS75870  Juncus howellii L. R. Heckard and J. H. Thomas 1974-9-10 2890 Colusa s East Peak (upper reaches of creek); Snow Mt., Dark Hollow Creek 2011 Comment
  JEPS106502  Juncus oxymeris L. P. Janeway 2001-6-6 7115 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow 610 Comment
  CHSC90870  Juncus phaeocephalus D. Isle 2002-6-28 176 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. Below a 4x4 Rd. 17N31 (Lovelady Ridge Jeep Rd.). 1060 Comment
  CDA31986  Juncus usitatus L. Ahart 2007-7-7 14258 Colusa South of the wire fence, on the south side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. Comment
  CHSC91664  Juncus xiphioides G. D. Barbe; Nola Parmer 1982-6-4 3638 Colusa Sacramento Valley. Along Goat Mountain Road, w of Lodoga-Stonyford Rd., Mendocino National Forest. Comment
  UC1221795  Juniperus californica Beecher Crampton 1958-5-19 4804 Colusa 1.3 mi s of Lodoga Comment
  UCD70298  Juniperus californica D. Sanchez-Mata 1998-7-9 s.n. Colusa Lodoga-Stonyford. Mendocino National Forest. Goat Mountain Road between Lodoga and Red Rock Cabin. Open California juniper woodland (Juniperus californica). 420 Comment
  CHSC65613  Juniperus occidentalis J. Ingraham 1995-4-13 6 Colusa 1 mi N of Davis Creek on hwy 395, 100 yds. E of junction of Co. Rd. 133B and Hwy 395, 100 yds E. 1487 Comment
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Jul 25 2018
  HSC97013  Keckiella corymbosa L. Ahart 2006-8-9 13102 Colusa S side of Stony Creek, at Mine Camp, about 3.5 mi. W of Stonyford. 422 Comment
  JEPS108915  Keckiella corymbosa Lowell Ahart 2006-8-9 13102 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  JEPS73509  Keckiella corymbosa L. R. Heckard 1972-7-10 3127 Colusa 3 mi nw and overlooking Fouts Springs (se corner of Snow Mt); Snow Mt. 1828 Comment
  JEPS73503  Kelloggia galioides L. R. Heckard 1972-7-10 3121 Colusa near Trout Crossing of trail to Box Springs (Snow Mt.); Snow Mt. 1828 Comment
  JEPS110095  Kickxia elatine Lowell Ahart 2006-8-9 13134 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  SEINET7075566  Koeleria macrantha A. G. Vestal 1955-4-5 s.n. Colusa In mountains [Cortina Ridge] west of Williams on Route 20 at Salt Canyon. 39? deg. 6' 22" North Latitude, -122? deg. 19' 15" West Longitude. UTM Zone 10, 558719mE, 4328566mN. (NAD 27)]. [Coordinate Datum: WGS84/NAD83]. Comment
  RSA746963  Lactuca serriola George K. Helmkamp, E. A. Helmkamp 2008-10-14 14244 Colusa Sacramento Valley: along CA-20, 0.2 mile east of the Sutter County Line 9 Comment
  CHSC70966  Lagophylla minor Vernon Oswald; Lowell Ahart 1998-5-7 8998 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  CHSC94692  Lagophylla minor Lowell Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford. 613 Comment
  JEPS110184  Lagophylla minor Lowell Ahart 2006-6-11 12667 Colusa On the east side of an off road trail (Trail 30), about 100 yards south of Fouts Road, about 5 miles (by road) west of Stonyford 613 Comment
  JEPS121113  Lagophylla minor Lowell Ahart 2013-5-1 18680 Colusa N of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  UC596300  Lagophylla minor R. F. Hoover 1938-4-24 3226 Colusa ridge between Venado and Leesville Comment
  UC89194  Lagophylla minor K. Brandegee Apr 1889 Colusa near Leesville Comment
  JEPS39671  Lagophylla minor Rimo Bacigalupi, T. Crovello, and L. Heckard 1965-4-26 9046 Colusa on road to Bartlett Springs 2 mi from Ladoga junction (summit w of Bear Valley, Colusa-Lake County boundary) 670 Comment
  CAS-BOT-BC341471  Lagophylla ramosissima Bruce G. Baldwin 1985-6-1 484 Colusa 3.2 miles north of junction with California State Highway 20 along Bear Valley Road Comment
  CHSC89865  Lagophylla ramosissima subsp. ramosissima B. Castro; L. Janeway 2001-4-12 1229 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Ck in hilly open blue oak woodland. In grassy understory on relatively flat ridgetop. 170 Comment
  UCD56930  Lamium amplexicaule Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3533 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 353 Comment
  CAS-BOT-BC290604  Lasthenia Peter Rubtzoff 1978-5-14 9167 Colusa Bear Valley Road, ca. 4-5 miles south of junction of the road to Fort Ross State Historic Park. Bartlett Springs Road. Comment
  HSC48034  Lasthenia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3939 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  CAS-BOT-BC337916  Lasthenia californica Joshua Suchocki; Charlene Vullo; Kyle Wear 1995-4-1 46 Colusa Along Bear Valley Rd., 1.2 miles west of the junction with Brim Rd. 414 Comment
  UCD23380  Lasthenia californica subsp. californica George C. Ziobro 1978-4-8 2 Colusa collected off of Bear Valley Road 10.3 miles north of the junction with State Route 20. 396 Comment
  CAS-BOT-BC324484  Lasthenia ferrisiae Alice Eastwood 1921-4-11 10232 Colusa Colusa Comment
  POM53876  Lasthenia ferrisiae Roxana S. Ferris 1917-4-12 503 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC353481  Lasthenia fremontii Roxana S. Ferris 1917-4-12 531 Colusa 4 miles E of Williams Comment
  CHSC28855  Lasthenia fremontii Joann Lacey 1979-3-31 11 Colusa Ca. 1 mi w of Williams, n side of Hwy 20. 25 Comment
  UCD18839  Lasthenia fremontii Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 146 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  SEINET5712846  Lasthenia glaberrima J. M. Tucker 1978-1 4408 Colusa West side of Bear Valley Road, 11 miles (by road) north of junction with State Hwy 20. 366 Comment
  RSA293117  Lasthenia glabrata subsp. glabrata J. P. Smith, Jane P. Nelson, Thomas W. Nelson 1978-4-2 9529 Colusa Bear Valley Road, 5 miles from its junction with State Route 20. 390 Comment
  UCD66913  Lasthenia gracilis Craig D. Thomsen 2008-4-27 s.n. Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Basin at top of ridge to the northwest of Eula Canyon and southwest of Cowboy Camp on the west side of Bear Creek. Center of basin. 487 Comment
  CHSC116580  Lathyrus jepsonii B. Castro; Tom Boullion 2015-6-15 17336 /4/20 Colusa Sacramento Valley. CA 5 air mi N of colusa, ca 0.5 mi E of Hwy 45 off N edge of Reservation Road. On upper terrace within levee, overlooking a riprap-lined bend in the Sacramento Rier (Rivermile ~154.3). 16 Comment
  CHSC75710  Lathyrus jepsonii var. californicus Vernon H. Oswald 1999-6-22 9782 Colusa West of Stonyford and 0.7 mi south of Letts Lake Road on FS 17N02. On a roadcut near a tributary of Miners Creek. 1353 Comment
  HSC67099  Lathyrus vestitus subsp. vestitus Teri Bartowski, Carol Zimmerer, Ruth Takaki, Shane Feusier 1980-4-19 38 Colusa Bartlett Springs Rd. at stream crossing. Comment
  HSC95805  Lathyrus vestitus subsp. vestitus A. Skelly, B. Bletcher, G. McCabe 1996-3-30 10 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  HSC103356  Lathyrus vestitus var. vestitus Thomas W. Nelson, Jane Nelson 1981-4-16 6419 Colusa Along Bartlet Springs-Bear Valley Rd., ~ 100 yds. from Bear Valley 610 Comment
  CAS-BOT-BC323887  Layia chrysanthemoides Alice Eastwood 1922-4-24 11191 Colusa Road between Princeton & Norman. Comment
  CAS-BOT-BC323901  Layia chrysanthemoides Mrs. H. C. Cantelow 1936-4-11 1155 Colusa Bear Creek Canyon. 396 Comment
  CDA11406  Layia chrysanthemoides G. F. Hrusa, K. van Katwyk 1995-4-22 12127 Colusa Inner North Coast Ranges; Bear Valley, 15 m. N of Hwy. 20. Comment
  CHSC81247  Layia chrysanthemoides J. Trizzino 2001-3-31 14 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  JEPS13437  Layia chrysanthemoides R. F. Hoover 1938-4-24 3221 Colusa Williams Comment
  JEPS39184  Layia chrysanthemoides W. I. Follette 1935-3-31 Colusa Williams Comment
  HSC95341  Layia chrysanthemoides A. Hove, A. Poteet, C. Sanville 1999-5-1 40 Colusa Bear Bear Valley Rd., 2 km S of Brim Rd. 415 Comment
  UCD135673  Layia chrysanthemoides Bruce G. Baldwin 1986-4-13 596 Colusa Bear Valley, immediately west of Bear Valley Road, 7.3 miles north of junction with California State Highway 20. Comment
  HSC85782  Layia fremontii Jeff Dunk, Tallchief Comet, David Munger 1987-4-12 66 Colusa Comment
  CHSC27623  Layia platyglossa Timothy Spira; Robert Schlising 1978-5-13 3249 Colusa Bear Valley, about 5 mi S of Leesville, on Bear Valley (= Wilber Springs) Road. Field. Comment
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May 24 2013
  CHSC65801  Layia platyglossa L. P. Janeway; B. Castro, Linnea Hanson, Beth Corbin, Kim Earl 1995-4-28 4761 Colusa Southern end of Bear Valley just west of where the road crosses Bear Creek. 396 Comment
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May 24 2013
  HSC96795  Layia platyglossa J. Carey, A. Hong, J. Leffingwell 1995-4-1 31 Colusa Bear Valley Rd., 1.2 mi. S of its junction with Brim Rd. 415 Comment
  UCR206869  Layia platyglossa George K. Helmkamp, E. A. Helmkamp 2009-1-31 14314 Colusa Sacramento Valley, junction of Moon Bend Road and CA-20 at the south end of the city of Colusa 23 Comment
  UCD82338  Layia platyglossa Robin McMaster 1973-4-15 324 Colusa 100 yd from junction of Hwys 16 and 25, next to Bear Valley Creek. Comment
  JEPS13435  Layia septentrionalis R. F. Hoover 1938-4-23 3206 Colusa grade on Rumsey; Arbuckle road Comment
  JEPS95624  Layia septentrionalis Vernon H. Oswald and L. Ahart 1994-3-23 6020 Colusa T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  UCR261621  Layia septentrionalis Ann Howald 2003-3-25 2284 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near dam, west of Little Stony Creek 355 Comment
  UCR261736  Layia septentrionalis Ann Howald 2003-4-23 2307 Colusa Inner North Coast Ranges, Lodoga-Stonyford Road, c. 0.1 mile north of road crossing of Little Stony Creek 382 Comment
  UC1101247  Lemna aequinoctialis Malcolm A. Nobs, S. Galen Smith 1949-9-10 1889 Colusa about 1 mi s of Maxwell Comment
  UC1101273  Lemna aequinoctialis Herbert L. Mason 1946-8-15 13009 Colusa 2 mi w on Williams Highway by bridge Colusa; Williams Highway Comment
  CHSC97126  Lemna minuta Lowell Ahart 2007-7-7 14259 Colusa Deep ditch, on the north side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  JEPS127105  Lemna minuta Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20723 Colusa About 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. Comment
  CHSC116664  Lemna trisulca Lowell Ahart; John Dittes, Josephine Guardino 2016-2-14 20722 Colusa Small pond on the east side of the gravel road, about 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. 966 Comment
  POM312464  Lemna trisulca C. Ritchie Bell 1951-6-13 1167 Colusa Lake below Letts Meadow on road from Bear Creek to Foutes Spring 915 Comment
  UCD138193  Lemna trisulca C. Richie Bell 1951-6-13 1167 Colusa below Letts Meadow on road from Bear Creek to Foutes Spring. 914 Comment
  CHSC61120  Lemna turionifera Vernon H. Oswald 1993-6-23 5570 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, near the SE corner of Cell 2, Pool 10. Along the edge of a marsh. 21 Comment
  UCR225659  Leontodon taraxacoides Craig D. Thomsen, Gordon Harrington 2008-7-6 2777 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek Canyon, along ridge trail 511 Comment
  UCD67066  Lepechinia calycina Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5094 -a Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. South of Dunsfield Flat. 554 Comment
  CHSC107952  Lepidium dictyotum var. acutidens B. Castro; T. Boullion 2011-4-20 1834 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 650 ft northeast of Tehama-Colusa Canal. Off northwest corner of large +- saline/alkaline wetland/marsh, scattered in vernally moist flats, vernal pools and large bald patch of bare whitish soil. 49 Comment
  CHSC62926  Lepidium dictyotum var. dictyotum Vernon H. Oswald; Lowell Ahart 1994-4-6 6074 Colusa Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford. Along a drainage. 548 Comment
  CHSC101071  Lepidium draba David W. Isle 2007-4-13 1633 Colusa East of Maxwell about 1 mile; south of Maxwell Rd. and east of Lyons Rd. in ditch between rice field east of Williams Dirk's shop. 30 Comment
  UCR233291  Lepidium lasiocarpum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17134 Colusa Eastern foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 2.0 miles southeast of Sites 85 Comment
  SD236244  Lepidium latifolium G. K. Helmkamp, E. A. Helmkamp 2008-10-14 14257 Colusa Sacramento Valley; along River Road (generally following the Sacramento River), 1.1 miles north of Colusa (Meridian 7.5'Q) 17 Comment
  UCD72469  Lepidium latifolium Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3803 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. Bank of Bear Creek near north end of bridge, west side of creek. 260 Comment
  CDA24916  Lepidium latipes D. Brown 1977-5-5 Colusa Terhel Farms Inc., Williams. 0 Comment
  UCD18852  Lepidium latipes Vernal Pool Team 2001; Carol Witham and Jennifer Buck 2001-4-30 160 Colusa 2 mi. south of the town of Colusa along Hwy 20, east of Hwy 20 and the Colusa Airport, Dolan Ranch site, pool # DOL001, UTMs: 10S0587786; 4336302. Comment
  UCD57874  Lepidium latipes var. latipes Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 52 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. About 250 feet north of Road Kill Cafe in flat meadow-pasture area. 385 Comment
  UCD57342  Lepidium nitidum Sergio Testa 2007-3-25 2 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  CHSC115390  Lepidium nitidum var. nitidum Lowell Ahart 2015-4-1 19990 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  HSC83341  Leptosiphon bicolor Clinton C. Shock 1980-5-3 57 Colusa Bear Valley, 12 mi. N of Hwy. 20 384 Comment
  HSC83422  Leptosiphon bicolor C. Pauls 1975-4-20 8 Colusa Bear Valley Rd., 8.7 mi. N of Hwy. 20 Comment
  UCD118630  Leptosiphon bicolor Clinton C. Shock 1980-5-3 57 B Colusa Bear Valley, about 12 miles north of State Highway 20. 384 Comment
  UCD57330  Leptosiphon bicolor Amy Whitcomb 2007-3-25 2 Colusa BLM Payne Ranch. Destanella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  HSC85856  Leptosiphon bicolor Bruce Delgado, Tim Tilghman, Rob Marheine 1987-4-11 Colusa Bear Valley, Bartlett Springs Rd. Comment
  UCD14332  Leptosiphon bicolor Nelson Cronyn 1984-4-22 3 Colusa Colusa Co.; 3.2 miles north of Highway 20 on Bear Valley Road, ca. 20 ft. west of road; 381 Comment
  UCD14428  Leptosiphon bicolor R. M. Rhode 1984-4-21 s.n. Colusa Colusa Co.; Bear Valley, 10 miles north of intersection of Highways 16 and 20; 426 Comment
  CHSC25156  Leptosiphon ciliatus J. D. Sagray 1970-4-4 4 Colusa 15 mi w of Williams at the junction of Hwy 20 and 16. 350 Comment
  CHSC40735  Leptosiphon ciliatus L. Constance 1938-4-22 2149 Colusa Above Salt Creek, Lower Lake-Williams road 11 mi. NE. of Lake-Colusa line, Inner North Coast Ranges. 152 Comment
  HSC65995  Leptosiphon ciliatus Cathie Goldberg, Lynn Kunstman, Lauren Philbrick, Geoff Walsh 1980-4-19 51 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville Comment
  HSC85857  Leptosiphon ciliatus Tim Tilghman, Rob Marheine, Bruce Delgado 1987-4-11 Colusa Bear Valley, Bartlett Springs Rd. Comment
  RSA589923  Leptosiphon ciliatus Michael A. Vincent, Robert M. Rhode 1996-3-30 7288 Colusa Along Bear Valley Rd. above Bear Creek, 0.6 mi. N jct. Wilbur Springs Rd. Comment
  HSC85855  Leptosiphon filipes Rob Marheine, Tim Tilghman, Bruce Delgado 1987-4-11 Colusa Bear Valley, Bartlett Springs Rd. Comment
  CHSC19694  Leptosiphon parviflorus L. A. Wright Jr. 1971-3-27 10 Colusa Ca. 7 mi w of Williams on Hwy 20, off the s side of the road about 150 ft, in a meadow next to a stream. 91 Comment
  UCD73115  Leptosiphon parviflorus Ellen Dean; G. Harrington 2008-3-17 4560 Colusa BLM Payne Ranch. Lands to the southwest of the intersection of Hwy 16 and Hwy 20. Along old, unimproved road that traverses the ridge above the saddle between Thompson and Craig Canyons. 418 Comment
  NY180562  Lessingia adenophora M. K. Curran 1884-1 s.n. Colusa At Epperson's Comment
  UC1563853  Lessingia nemaclada Barbara Ertter with Elizabeth Neese, Laura Fujii, and Dawn Espindola 1989-10-21 8877 Colusa near end East Park Road from Stonyford (nw side of reservoir); East Park Reservoir 365 Comment
  RSA134705  Lessingia nemaclada P. H. Raven, R. Snow 1959-9-11 14425 Colusa About 2 miles south-east of Happy Camp 762 Comment
  JEPS94888  Lessingia ramulosa Vernon H. Oswald and Lowell Ahart 1998-7-15 9276 Colusa w side of county on Sawtelle Valley Road 0.4 mi n of Bartlett Springs Road; Sawtelle Valley Road 670 Comment
  UC1552844  Lessingia ramulosa Frederica Bowcutt 1985-6-19 604 Colusa about 2 air mi n Wilbur Hot Springs (just sw of Bear Valley); Bear Valley, Wilbur Hot Springs Comment
  HSC63081  Lewisia rediviva David Wheeler 1979-4-14 62 Colusa Buck Flat, Walker Ridge, on the way to Barrel Springs 884 Comment
  UCD56681  Lewisia rediviva Roger Willmarth 2007-3-25 1 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 563 Comment
  UC1736070  Lewisia rediviva var. rediviva Dean W. Taylor 1993-3-18 13310 Colusa East Park Reservoir, on stony hillsides ca. 0.4 miles due west from spillway into Little Stony Creek, 411 Comment
  CAS-BOT-BC444476  Lewisia triphylla G. Thomas Robbins; L. R. Heckard 1956-7-25 3708 Colusa Along trail due south of Snow Mt. East and skirting the eastern base of the ridge forming Snow Mt. West 2042 Comment
  JEPS76124  Leymus triticoides W. L. Jepson 1938-6-11 18990 Colusa on creek 4 mi se Wilbur Springs; Bear Creek Comment
  UC38247  Leymus triticoides J. Burtt Davy May, 1898 4290 Colusa near Princeton Comment
  JEPS75708  Lilium pardalinum Alice Q. Howard 1972-7-10 11 Colusa along trail between Fouts Camp and Box Springs (on n side of ridge separating Trout Creek and Paradise Creek); Snow Mountain 1600 Comment
  JEPS96000  Lilium pardalinum subsp. pardalinum Vernon H. Oswald and L. Ahart 1999-6-22 9789 Colusa 2.2 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek: T17N R6W Sect. 30, ca. 1400 ft, chaparral, serpentine substrate 426 Comment
  CHSC53964  Limnanthes douglasii subsp. nivea Vernon H. Oswald 1991-4-21 4517 Colusa Lodoga Stonyford Rd, ca. 2 mi south of Stonyford. Along drainages in pastures. 371 Comment
  JEPS19577  Limnanthes douglasii subsp. rosea Ruth Johnson 1918-4-6 Colusa College City Sacramento Valley Comment
  UC109406  Limnanthes douglasii subsp. rosea Brandegee April 1889 Colusa Colusa Junction Comment
  UCD143419  Linanthus Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCD82495  Linanthus Craig Thomsen; G. Harrington 2009-5-12 2845 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UC971715  Linanthus bolanderi Herbert L. Mason 1941-4-5 12404 Colusa 3 mi s Stonyford Comment
  SEINET7096751  Linanthus ciliatus A. G. Vestal 1955-4-5 s.n. Colusa Along Route 16 about 0.2 miles south of Route 20 and near Bear Creek. NAD27, 39? deg. 00' 36ao, -122?_ 21' 22ao (converted to WGS84 decimal degrees) Comment
  UC1745721  Linanthus ciliatus Annetta M. Carter, Sarah Dyal, Ethel Crum 1938-5-7 1376 Colusa Open ridge crest 0.1-0.2 mi. W of summit of Rumsey-Arbuckle rd. 4.2 mi. from Rumsey. Comanche Hills (?). Comment
  UC73621  Linanthus ciliatus Miss Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD118534  Linanthus dichotomus Beecher Crampton 1958-4-21 9172 Colusa 4 miles NW of Lodoga (by road). Comment
  UC125228  Linanthus filipes Katharine Brandegee Apr 1889 Colusa Leesville Comment
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  JEPS74814  Linanthus parviflorus L. R. Heckard, T. I. Chuang and R. Bacigalupi 1975-5-7 4022 Colusa sw of Leesville (just sw of site of old Kowalski ranch (below upper dam road), Upper Indian Valley); Upper Indian Valley 396 Comment
  JEPS39670  Linanthus parviflorus Rimo Bacigalupi, and T. Crovello, and L. Heckard 1965-4-26 9047 Colusa 2.5 mi from Ladoga junction (at summit w of Bear Valley on road to Bartlett Springs, Colusa-Lake County boundary) 670 Comment
  UCD118726  Linanthus pungens G. Ledyard Stebbins Jr. 1964-7-4 6172 Colusa Mt. St. John, west of Stonyford. 1676 Comment
  CHSC77955  Lithophragma affine Beth Hendrickson; Heidi West 1999-3-23 Colusa Vicinity of Antelope Valley, Funks Creek, and Golden Gate. 137 Comment
  JEPS15252  Lithophragma affine Rimo Bacigalupi with G. Ledyard Stebbins and Peter Kamb 1950-4-16 3111 Colusa 4 mi s Ladoga (and 6 mi nnw of Leesville, along Little Indian Creek); Indian Valley, Little Indian Creek 396 Comment
  UCD163884  Lithophragma affine Craig D. Thomsen 2002-4-10 2596 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.75 mile west of Hwy 20/16 instersection. Comment
  UC71648  Lithophragma bolanderi Miss Alice King 1905-1 Colusa College City Comment
  UCD102676  Lithophragma campanulatum A. M. Shapiro 1994-6-12 s.n. Colusa Below Steel Trap Rock, vicinity of Goat Mtn. (close by to the south of the rock). 1310 Comment
  HSC92471  Lithophragma heterophyllum Brad Kerstetter, Roxanne Jackson, Jeff Cox 1995-5-6 52 Colusa Blue Oak Campground 549 Comment
  UCD159333  Logfia filaginoides D. S. Park 2010-6-5 117 Colusa Walker ridge, Cold Spring Mt. roadside and adjacent grassland. 760 Comment
  HSC47737  Logfia gallica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3943 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS80876  Lolium perenne L. R. Heckard and J. C. Hickman 1980-7-3 5365 A Colusa sw slope Snow Mt. (grazed slopes about Summit Springs); sw slope of Snow Mt., about Summit Springs 1554 Comment
  UCR233445  Lolium perenne subsp. multiflorum George K. Helmkamp, E. A. Helmkamp 2011-4-1 17119 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  UCD143424  Lomatium Oren Pollak 1987-4-10 s.n. Colusa Bear Valley. Comment
  UCR206393  Lomatium George K. Helmkamp, E. A. Helmkamp 2009-3-11 14374 Colusa Inner North Coast Range Foothills, along CA-20, 14.3 miles southwest of Williams 375 Comment
  SEINET13944353 Image available Lomatium caruifolium Milo S. Baker 1947-1 11646 Colusa Near hwy 20, about 1 mi E. of Lake-Colusa County line Comment
  OBI54946  Lomatium ciliolatum var. hooveri Robert F. Hoover 1941-5-2 4987 Colusa Just E of Lake Co. line on Williams-Clear Lake hwy Comment
  CAS-BOT-BC478201  Lomatium hooveri Ann Howald 2003-3-26 2288 Colusa Inner Coast Ranges: Indian Valley, East Park Reservoir, Catholic Point peninsula, near Coppermine Road, c. 0.3 miles northwest of intersection with East Ruby King Road 419 Comment
  CHSC70858  Lomatium hooveri Vernon Oswald; Lowell Ahart 1998-4-21 8943 Colusa Stonyford-Logoda Rd. 3.7 mi south of Stonyford. 384 Comment
  LA90233  Lomatium hooveri Lincoln Constance; 1965-4-13 3756 Colusa Between Clear Lake Oaks and Williams, Highway 20, 2.7 mi. W of Highway 16 548 Comment
  UC1073298  Lomatium hooveri George B. Rossbach 1955-4-9 374 Colusa on Route 20 w. edge Colusa Co. 563 Comment
  UC1178993  Lomatium hooveri Herbert L. Mason 1947-3-30 13164 a Colusa 0.5 mi E of Lake Co. line on Williams-Lower Lake Highway western Colusa Co. Comment
  UCD110811  Lomatium hooveri Christopher Mallek 2008-1 s.n. Colusa Pacific Ridge. Border of Colusa and Lake Counties. 1101 Comment
  CHSC116064  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  CHSC81209  Lomatium macrocarpum L. P. Janeway; Gail Kuenster 2001-3-27 6990 Colusa Vicinity of Sites, Lurline Creek, and Sulphur Gap. 384 Comment
  JEPS121106  Lomatium macrocarpum Lowell Ahart 2013-5-1 18676 Colusa On the N side of the wash and Hwy 20, just E of Lake County line, 12.2 air miles ENE of the town of Clear Lake, 17.1 air miles W of Williams. Comment
  RSA0036993  Lomatium macrocarpum Lowell A. Ahart 2013-5-1 18676 Colusa North of the wash and State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  RSA0060080  Lomatium macrocarpum Richard R. Halse 2014-3-25 9033 Colusa Along the Leesville-Logoda Road ca. 5.6 miles south of Logoda; Indian Valley. 425 Comment
  SEINET196147  Lomatium marginatum Robert F. Hoover 1941-5-2 4987 Colusa Just east of lake Coutny line on Williams Clear Lake highway Comment
  SEINET13944634 Image available Lomatium tomentosum Jack Major, Eilif Dahl 1962-1 sn Colusa Bear Valley Comment
  JEPS17548  Lomatium utriculatum Alice King May, 1906 Colusa College City Comment
  SEINET11587934  Lomatium utriculatum Unknown 2009-3-11 14374 Colusa Williams Comment
  UC1053478  Lomatium utriculatum Rimo Bacigalupi and Arthur Holmgren 1950-4-25 3177 Colusa 10 mi. n.w. Sites (Grapevine Grade to Lodoga) Comment
  UC630426  Lomatium utriculatum Annetta Carter 1938-5-8 1393 Colusa 6 mi S of Leesville (Bear Valley, Wilbur Springs road); Inner North Coast Range 426 Comment
  UCD57818  Lomatium utriculatum Gordon Harrington 2007-4-17 30 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Destanella Flat, just south of Hwy 20, approximately 3.4 road miles west of the Hwy 16 intersection. 527 Comment
  UCD64263  Lomatium utriculatum Craig D. Thomsen 2000-3-31 2060 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  RSA0010483  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites-Logoda Road ca. 5.2 miles northwest of Sites. 175 Comment
  SEINET11262797  Lomatium vaginatum Richard R. Halse 2014-3-25 9028 Colusa Along the Sites Logoda Road ca. 5.2 miles NW of Sites.; 0 175 Comment
  UCD57666  Lonicera interrupta Erica A. Smith; with Plant Biology 102 2007-4-29 4 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central/Eastern part of ranch. Craig Canyon. Along unimproved road, 100 yards west of where road crosses Craig Creek. 313 Comment
  UCD70235  Lonicera interrupta D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 450 Comment
  CAS-BOT-BC198625  Lotus Roxana S. Ferris 1917-4-14 577 Colusa Foothills 7 miles west of Arbuckle, Arbuckle-Rumsey Road. Comment
  CAS-BOT-BC234977  Lotus grandiflorus Ellen Dean; C. Thomsen; G. Harrington; R. Wilmarth; R. Wenk 2010-6-2 6045 Colusa Walker Ridge. Along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 769 Comment
  CDA15501  Lotus grandiflorus G. F. Hrusa, Willie the Dog 1998-6-19 14638 Colusa North Coast Ranges; Below Fouts Springs on Fouts Springs Rd. to Stonyford. Immed. below Candy Bucket Spring crossing. Comment
  UCR257975  Lotus grandiflorus Ellen Dean, Craig D. Thomsen, Gordon Harrington, R. Wilmarth, R. Wenk 2010-6-2 6045 Colusa Walker Ridge, along Walker Ridge Road on southern part of the ridge, south of turnoff to Indian Valley Reservoir 770 Comment
  JEPS60197  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2231 Colusa 1.5 mi ne Fouts Springs (near junction of Stonyford-Fout Springs road and Trough Spring Ridge road) 670 Comment
  JEPS83028  Lotus grandiflorus var. grandiflorus L. R. Heckard 1969-5-28 2236 Colusa about 5 mi w Stonyford (along Trough Spring Ridge road 0.5 mi sw of its junction with the Stonyford-Fouts Spring road); Trough Spring Ridge 731 Comment
  HSC72211  Lotus humistratus Thomas W. Nelson, Jane P. Nelson 1980-6-24 5879 Colusa Along road to Snow Mtn. trail head at Summit Springs 1585 Comment
  UC726262  Lotus humistratus A. A. Heller 1940-6-7 15714 Colusa e of Lodogo (on the Lodogo-Sites road, near the foot of the grade) Comment
  JEPS110105  Lotus purshianus var. purshianus Lowell Ahart 2006-8-9 13150 Colusa North side and under the bridge across Stony Creek, just north of Stonyford 347 Comment
  RSA746969  Lotus purshianus var. purshianus George K. Helmkamp, E. A. Helmkamp 2008-10-14 14242 Colusa along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  UCD65955  Ludwigia hexapetala B. J. Grewell 2006-9-15 06- 67 -LU Colusa Colusa National Wildlife Refuge, south of Hwy 20, west of Colusa and Sutter Buttes. Glenn-Colusa Irrigation District West Lateral Canal at western refuge boundary, public auto tour route. 13 Comment
  UCD65956  Ludwigia hexapetala B. J. Grewell 2006-9-15 06- 68 -LU Colusa Colusa National Wildlife Refuge, south of Hwy 20, west of Colusa and Sutter Buttes. 12 Comment
  UCD78320  Ludwigia peploides subsp. peploides B. J. Grewell; Mike Wolder 2006-7-11 06- 16 -LU Colusa Colusa National Wildlfe Refuge, west of Colusa, CA. CNWR tract T24.8. 14 Comment
  UCD105904  Lupinus albifrons Beecher Crampton 1975-4-21 9163 Colusa 1.5 miles southeast of Sites. Comment
  RSA783302  Lupinus albifrons var. albifrons R. R. Halse 2010-3-21 7830 Colusa Along State Hwy 20 ca. 10.7 miles SW of its junction with Interstate Hwy 5 at Williams. In Salt Canyon. 154 Comment
  JEPS22986  Lupinus albifrons var. collinus Stanton A. Cook 1959-5-30 891 Colusa n of the summit Goat Mountain; n of the summit of Goat Mountain 1828 Comment
  JEPS80459  Lupinus albifrons var. collinus Alice Q. Howard 1972-7-10 14 Colusa between Dark Hollow and Paradise Creeks; between Dark Hollow and Paradise Creeks 1402 Comment
  UCR233447  Lupinus albifrons var. collinus George K. Helmkamp, E. A. Helmkamp 2011-4-1 17121 Colusa Eastern Foothills North Coast Ranges, Antelope Valley, along Maxwell-Sites Road, 1.8 miles southeast of Sites 77 Comment
  HSC72138  Lupinus bicolor J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9570 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  SEINET3271563 Image available Lupinus bicolor George K. Helmkamp, E. A. Helmkamp 2009-3-11 14383 Colusa Sacramento Valley; on the south side of CA-20 just west of the junction with Freshwater Road, northwest edge of Williams 49 Comment
  UC764136  Lupinus bicolor R. F. Hoover 1938-4-24 3219 Colusa w Arbuckle (Sand Creek foothills); Sand Creek foothills Comment
  UCD163666  Lupinus bicolor Craig Thomsen 1999-4-15 1966 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD83718  Lupinus bicolor Joseph Schlottman; with PLB 102 class 2010-5-2 4 Colusa East slope of Walker Ridge. Eaton Springs. Adjacent to main creek. 710 Comment
  UCD15277  Lupinus bicolor Claire Warshaw 1985-4-13 21 Colusa along Bear Valley Road, 45 miles northwest of intersection with Highway 22. 420 Comment
  UCD73530  Lupinus bicolor John Anderson 2007-5-1 s. n. Colusa Bear Valley. Comment
  POM20193  Lupinus densiflorus var. aureus Roxana S. Ferris 1917-4-14 584 Colusa 7 miles west of Arbuckle, along Sand Creek. Arbuckle-Ramsey Road. Comment
  POM163463  Lupinus densiflorus var. aureus Roxana S. Ferris 1926-4-23 6415 Colusa At Mountain House on the Williams-Stonyford Road. Comment
  RSA424727  Lupinus densiflorus var. aureus Aaron Liston, M. Blumler 1987-4-26 617 -1 Colusa 15.7 miles south of Stonyford. Lessville - Lodoga Road. Comment
  SEINET10485227  Lupinus densiflorus var. aureus Clemens 1977-4-16 CLEMENS 17 Colusa Moderate population, salt creek canyon, n side of salt creek, hwy 20, 10 mi w-sw of williams. Wilbur springs quad, t.15n, r.4w, sec.32, 15 ft e central border. Open bank along roadside. 143 Comment
  SEINET10838182  Lupinus densiflorus var. aureus J. P. Kroessig 1977-4-16 Kroessig 9 Colusa Corolla yellow-white, pleasantly scented. Large population ca. 0.3 Mi. Sw of Jct of hwys 20 and 16, s side of bear creek, ca 18 mi. Sw of williams. Wilbur Springs quad, 15'. S central border of sec 36, t14n, r5w. Open foothill Woodlands. 322 Comment
  SEINET10485385 Image available Lupinus formosus var. robustus A. Arthur Heller 1940-4-21 Heller 15543 Colusa Plentiful in fields and along the highway 2 miles south of Williams. Upper Sonoran Life Zone. Comment
  UCD107778  Lupinus formosus var. robustus D. E. Breedlove 1963-4-20 4624 Colusa 11 miles W of Arbuckle on the Rumsey-Arbuckle Road. Comment
  UCD66957  Lupinus latifolius var. latifolius Ellen Dean; Davis Botanical Society 2008-5-31 5001 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road. 1099 Comment
  JEPS81270  Lupinus luteolus L. R. Heckard and J. C. Hickman 1982-7-5 5878 Colusa slope below (s) Summit Springs (s side of Snow Mt.); , s of Summit Springs 1500 Comment
  UCD81894  Lupinus luteolus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5778 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Along Bear Creek opposite Cowboy Camp parking lot, on W side of creek. 314 Comment
  SD27803  Lupinus menziesii Carl B. Wolf 1928-5-7 2121 Colusa 17 miles east of [Houghs] Springs on the road to Williams 456 Comment
  JEPS65094  Lupinus microcarpus var. densiflorus W. L. Jepson 1932-5-7 16264 Colusa valley above Venado; Venado (valley above) 304 Comment
  UC614570  Lupinus microcarpus var. densiflorus L. Constance 1938-4-22 2147 Colusa 11 mi ne Lake-Colusa line (above Salt Creek); Inner North Coast Ranges, above Salt Creek 152 Comment
  UCD57462  Lupinus microcarpus var. densiflorus Ellen Dean; W. Murray, J. Alderson, B. Weiss, M. Starbuck 2007-4-7 3642 Colusa Payne Ranch (owned by BLM), lands just west of Hwy 16, about 2 road miles south of junction of Hwy 20 and Hwy 16. Mouth of Craig Canyon, along unimproved road. 316 Comment
  UCR206292  Lupinus microcarpus var. densiflorus George K. Helmkamp, E. A. Helmkamp 2009-5-20 14736 Colusa Central Inner Coast Ranges, along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  JEPS108050  Lupinus microcarpus var. densiflorus Rhonda Riggins 1982-5-30 1448 Colusa Roadside Ladoga-Leesville Road, 4.4 mi N Leesville. 457 Comment
  UC614851  Lupinus microcarpus var. densiflorus Beryl O. Schreiber 1932-4-3 223 Colusa road to Williams; road to Williams Comment
  CHSC91822  Lupinus microcarpus var. microcarpus D. Isle 1995-4-27 403 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. East Park Reservoir Rd. at N edge just at rt. angle turn, w. of cattle guard 1/4 mi. 347 Comment
  UCD66534  Lupinus microcarpus var. microcarpus Craig D. Thomsen 2000-6-23 2421 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  RSA424766  Lupinus nanus var. apricus Aaron Liston, M. Blumler 1987-4-26 667 -9 Colusa Bear Valley - Lodoga Road, 6.6 miles S of Bartlett Springs Jct. Comment
  POM163514  Lupinus polycarpus Roxana S. Ferris 1926-4-22 6297 Colusa 2 miles west of Colusa Comment
  HSC48193  Lupinus vallicola subsp. apricus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3963 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  SEINET10490294  Lupinus vallicola subsp. apricus Thomas W. Nelson, Jane P. Nelson 1978-4-29 Nelson 3963 Colusa Along bear valley rd. 2.5 Mi from jct with state route 20. Oak woodland. 366 Comment
  CAS-BOT-BC441312  Luzula subsessilis F. P. Cronemiller 1924-5-12 876 Colusa Lower Letts Valley 1249 Comment
  CHSC107980  Lythrum californicum B. Castro; Joe Silveira, Tom Boullion 2011-6-10 1883 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, I mi southeast of Funks Reservoir and 0.2 mi northeast of Tehama-Colusa Canal. Ca 100 ft E of large +- saline/alkaline wetland/marsh, on S edge of compacted E-W road track that goes through marsh. 49 Comment
  CHSC47439  Lythrum californicum Lowell Ahart 1980-6-11 2371 Colusa On the east side of River Road, where the road dips and floods during high water, about 9 1/2 miles north of Colusa. 30 Comment
  CHSC78980  Lythrum californicum Vernon H. Oswald 2000-9-29 9973 Colusa Colusa National Wildlife Refuge. 13 Comment
  UC1191570  Lythrum californicum Herbert L. Mason, Verne Grant 1946-8-7 12977 Colusa 8 mi n of Colusa (Butte Sink); Butte Sink Comment
  CHSC94454  Lythrum hyssopifolia Lowell Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  RSA0015862  Lythrum hyssopifolia L. Ahart 2006-8-9 13161 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 348 Comment
  SD211626  Lythrum tribracteatum Barbara Ertter, Elizabeth Neese, et al 1989-10-21 8870 Colusa Southeast end of East Park Reservoir North of Lodoga, narrow strand on shady substrate 366 Comment
  UC1609445  Lythrum tribracteatum Vernon H. Oswald and Lowell Ahart 1993-5-27 5429 Colusa 0.5 mi nw of Sites (bordering the w side of Sacramento Valley, Sites-Lodoga Road); Sacramento Valley, Sites-Lodoga Road 121 Comment
  UC1619949  Lythrum tribracteatum Barbara Ertter with Elizabeth Neese, Laura Fujii, Dawn Espindola 1989-10-21 8870 Colusa SE end of East Park Reservoir N of Lodoga 365 Comment
  UC1543163  Madia citriodora Charlotte G. Nast 1936-4-17 147 Colusa Williams to Lake Co. Road; Williams to Lake Co. Road Comment
  UC638653  Madia citriodora Ethel Crum 1938-5-8 2031 Colusa 3 mi n Leesville 426 Comment
  UCD162973  Madia elegans Jack Major 1963-5-4 s.n. Colusa Bear Valley in grassland at south end of the valley. (Exact location unknown. Coordinates estimated by label maker.) 396 Comment
  CHSC27631  Madia exigua Timothy Spira; Robert Schlising 1978-5-13 3239 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC79467  Madia exigua B. Castro; L. P. Janeway 2000-5-2 1111 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 231 Comment
  RSA755624  Madia exigua George K. Helmkamp, E. A. Helmkamp 2009-5-20 14741 Colusa Along CA-16 near Bear Creek, 1.6 miles south of the junction with CA-20 320 Comment
  UC638697  Madia exigua Ethel Crum 1938-5-7 2008 Colusa 4.2 mi n Rumsey (Comanche Hills, summit of ridge); Inner North Coast Range 254 Comment
  CHSC101645  Madia gracilis David W. Isle 2003-5-15 1630 Colusa Mendocino National Forest; about 6 mi. W of Stonyford; N aspect serpentine chaparral slope S of (M-10) (18N01.2) and just W of OHV Trail 30 (18N78) jct. On August 8, 2001 Trough Fire Burn Site. MDB and M. 585 Comment
  CHSC86127  Madia gracilis Jenny Marr; Julie Cunningham, Heidi West, Caroline Warren 1998-5-27 Colusa Vicinity of Antelope Valley, Antelope Creek, and Huffmaster Road. 121 Comment
  UCD67039  Madia gracilis Ellen Dean; Davis Botanical Society 2008-5-31 5019 Colusa west of I-5 at Maxwell, Goat Mountain, ridge below summit off of Goat Mountain Road. 1734 Comment
  UCD159852  Madia hallii G. Ledyard Stebbins 1985-4-19 C 503 Colusa South end of Walker Ridge, along Walker Ridge Road, 0.25 miles northeast of its junction with road to Indian Valley Dam. (Note by label-maker: Section 12 is farther than 0.25 miles NE of road to Indian Valley Dam. Georeferenced this record in Section 13). Comment
  RSA141307  Madia minima J. M. Tucker 1959-5-30 3520 Colusa Ca. 2 miles (by road) below the summit of Goat Mountain (ca. 1.25 miles, airline, north-northwest of Goat Mountain Lookout) 1646 Comment
  RSA262347  Maianthemum stellatum J. M. Tucker, L. K. Mann 1959-5-30 3529 Colusa Small lake in Mill Valley, ca. 1/4 mile northwest of Lower Letts Valley, and ca. 4 miles, airline, north of Goat Mountain Lookout 1220 Comment
  CHSC110854  Malacothamnus fremontii David Isle; Rhonda Isle 2013-6-23 2044 Colusa Just E of Maxwell Grade Summit and pass; hot-burned S aspect slope N of Sites Lodoga Road (at Grapevine Pass). In July 2012 Sites Fire Area. 562 Comment
  UCR281732  Malacothamnus fremontii David Isle, Frank Elliott 2014-6-11 2134 Colusa Northern Sacramento Foothills, Frank and Judy Elliott Ranch, c. 1 mile south of Rail Canyon Road junction with Sites-Lodoga Road and c. 0.5 mile south of Sites-Lodoga Road 604 Comment
  CHSC59692  Malacothrix californica Janet Delight 1978-4-8 5 Colusa Ca. 0.3 mi. w of jct of Hwys 20 and 16, s side of Bear Creek, ca. 18 mi sw of Williams. 321 Comment
  UCD83450  Malacothrix clevelandii Craig Thomsen; G. Harrington 2009-5-12 2826 Colusa Colusa County on Walker Ridge: About 200 yards south of spur road enroute to Eaton Springs from Walker Ridge Rd. ( About 1/2 mile east of Walker Ridge Road) 822 Comment
  CAS-BOT-BC347385  Malacothrix floccifera Alice Eastwood; John Thomas Howell 1938-5-16 5635 Colusa Lake-Colusa Co. line on road to Williams Comment
  CDA11410  Malacothrix floccifera G. F. Hrusa, K. van Katwyk 1995-4-22 12131 Colusa Inner North Coast Ranges; Leesville Rd. at summit of ridge immed. E of N end of Bear Valley. Comment
  CHSC27632  Malacothrix floccifera Timothy Spira; Robert Schlising 1978-5-13 3237 Colusa Just E of Lake County line, along Hwy 20. Comment
  CHSC86522  Malacothrix floccifera B. Castro; Beth Hendrickson 2003-3-19 1393 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 243 Comment
  UC1053472  Malacothrix floccifera Rimo Bacigalupi and Arthur Holmgren 1950-4-26 3185 Colusa just w Bear Valley (just w of base of the grade to Indian Valley (Bartlett Mt. Road)); Inner North Coast Ranges Comment
  UCD63101  Malacothrix floccifera Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4932 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Unnamed drainage south of Hwy 20 between Hwy 16 and Lynch Canyon that drains to Bear Creek by passing under Hwy 20. 348 Comment
  CAS-BOT-BC347388  Malacothrix floccifera Volney Rattan 1884-1-1 s.n. Colusa Unspecified Comment
  RSA135416  Malacothrix floccifera Volney Rattan 1884-1 s.n. Colusa [no location specified] Comment
  UC1174491  Malacothrix floccifera Volney Rattan 1884-1 Colusa Comment
  CHSC107935  Malvella leprosa B. Castro; Amy Lyons 2011-8-3 1902 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; approximately 0.7 mi southeast of Funks Reservoir and 350 ft northeast of Tehama-Colusa Canal. In grassland in patch under transmission lines ca 0.3 mi northwest of large +- alkaline marsh. 52 Comment
  CHSC96927  Malvella leprosa Lowell Ahart 2007-7-7 14261 Colusa On north side of the Gridley Colusa Highway, about 1 1/4 miles east of River Road, about 17 miles west of Gridley. 20 Comment
  POM62148  Malvella leprosa Roxana Stinchfield 1916-6-17 294 Colusa At Tule levee, College City. Comment
  UC1368667  Malvella leprosa L. M. Moe 1969-7-29 98 Colusa along Butte Creek ca. 3 mi. n.e. Colusa (also along rd. of Butte Creek Outing Club property); Butte Creek Comment
  UC18825  Malvella leprosa J. Burtt Davy May, 1898 4303 Colusa Princeton Comment
  CDA32964  Malvella leprosa Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  RSA121079  Malvella leprosa H. S. Yates 1936-8-14 6130 Colusa 3 miles S. of Colusa 15 Comment
  UCD169735  Marah fabacea Richard R. Halse 2014-3-25 9029 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  RSA0010481  Marah watsonii Richard R. Halse 2014-3-25 9031 Colusa Along the Sites-Logoda Road ca. 4.7 miles northeast of Logoda; on the west end of Grapevine Pass. 527 Comment
  SEINET4208912  Marah watsonii Richard R. Halse 2013-3-26 8744 Colusa Along the Leesville-Logoda, or 3.2 miles north of the junction of Leesville and Bear Valley Roads; Indian Valley.; 0 426 Comment
  POM174574  Marah watsonii Roxana S. Ferris 1926-4-23 6593 Colusa On Grapevine Grade; Stonyford-Sites Road. Comment
  JEPS374  Marsilea vestita subsp. vestita W. L. Jepson 1934-7-28 16751 Colusa Williams Comment
  UC75895  Matricaria occidentalis Miss M. Alice King 1905-1 Colusa near City College; Sacramento Valley Comment
  UCD163222  Medicago polymorpha Craig D. Thomsen 2000-3-31 2081 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  UCD56908  Medicago polymorpha Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3511 Colusa BLM Payne Ranch. In Craig Canyon. Southwest of intersection of Hwy. 16 and Hwy. 20. 326 Comment
  UCR206895  Medicago polymorpha George K. Helmkamp, E. A. Helmkamp 2009-3-11 14361 Colusa Sacramento Valley, along CA-20, 1.6 miles southwest of Colusa and just north of Colusa National Wildlife Refuge 15 Comment
  UCR205147  Medicago sativa George K. Helmkamp, E. A. Helmkamp 2008-10-14 14253 Colusa Sacramento Valley, along CA-20, 0.2 mile east of the Sutter County line 9 Comment
  UCD107925  Medicago sativa Beecher Crampton 1963-8-5 6873 Colusa 3.5 miles south of Grimes. Comment
  UCD107927  Medicago sativa Beecher Crampton 1963-8-5 6874 Colusa 3.5 miles south of Grimes. Comment
  CHSC100290  Melica californica D. Isle 1988-4-13 1513 Colusa Mendocino National Forest - North Coast Ranges. Middle Fork Stony Creek Watershed. Mellow-D Ranch meadow just north of 1st bad erosion channel in area burned during 1987 Fouts Fire. 731 Comment
  CHSC112266  Melica californica Lowell Ahart; John Dittes, Josephine Guardino 2013-4-26 18639 Colusa Inner North Coast Range. North side of State Highway 20, just east of Lake County Line, 12.2 miles (air) east-northeast of Clear Lake (town), 17.1 miles (air) west of Williams. 566 Comment
  CHSC79629  Melica californica B. Castro; L. P. Janeway 2000-5-4 1132 Colusa Vicinity of Sites, Sites-Lodoga Rd, and Grapevine Creek. 268 Comment
  UCD82124  Melica californica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5653 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 839 Comment
  UCR119121  Melica californica Beecher Crampton 1958-4-21 4730 Colusa Inner North Coast Ranges, 7.8 miles northwest of Rumsey, along Highway 16, just above junction of Bear Creek with Cache Creek. 381 Comment
  JEPS81294  Melica harfordii L. R. Heckard and J. C. Hickman 1982-7-5 5908 Colusa just off creek below Summit Springs (s side of Snow Mt.); Snow Mt. 1500 Comment
  UCD66576  Melica torreyana Craig D. Thomsen 2001-5-24 2524 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCR212338  Melica torreyana Craig D. Thomsen 2001-5-24 2510 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way, south side of Hwy 20, c. 0.5 mi west of Hwy 20/16 intersection (between mileposts 2.17 and 2.25). 342 Comment
  JEPS108722  Melilotus albus Lowell Ahart 2006-9-26 13349 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  UCD64430  Melilotus indicus Craig D. Thomsen 2000-4-28 2211 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD169976  Melilotus officinalis G. F. Hrusa 1999-5-16 15050 Colusa Little Stony Creek. 457 Comment
  UCD163656  Mentzelia laevicaulis Craig Thomsen 1998-6-10 1954 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD170080  Mentzelia micrantha Jack Alderson 2016-5-14 s.n. Colusa BLM Bear Creek Ranch (formerly Payne Ranch); 5500 feet (1675 m) south of the intersection of Highway 20 and the Colusa County line. 499 Comment
  UCD63030  Micranthes californica Ellen Dean; C. Thomsen, N. Voegtly, J. Alderson, G. Harrington 2008-3-30 4682 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Eula Canyon. 313 Comment
  UCR261642  Micropus californicus Ann Howald 2003-4-23 2310 Colusa Inner North Coast Ranges, Indian Valley, East Park Reservoir, Catholic Point peninsula, west of Coppermine Road, c. 0.05 mi north of intersection with East Ruby King Road 428 Comment
  UCD82822  Micropus californicus var. californicus Craig Thomsen; G. Harrington 2009-5-12 2844 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  CHSC30421  Microseris douglasii J. D. Jokerst 1980-4-12 573 Colusa S of Hwy 20, 0.3 mi E of its jct with Hwy 16. Comment
  CHSC114968  Microseris douglasii subsp. douglasii Lowell Ahart 2015-4-1 20001 Colusa Along Bear Valley Road, in Bear Valley, about 50 yards west of Bear Creek, about 6 miles south of Leesville, about 6 miles south of Highway 20. 395 Comment
  CHSC86872  Microseris douglasii subsp. douglasii B. Castro 2003-4-3 1413 Colusa Vicinity of Sites, Golden Gate, and Funks Ck. 82 Comment
  JEPS35674  Microseris douglasii subsp. douglasii W. L. Jepson 1932-5-8 16270 Colusa Ladoga Ladoga (w Colusa County) 457 Comment
  JEPS36201  Microseris douglasii subsp. douglasii W. L. Jepson 1920-5-23 8970 Colusa Bear Valley 426 Comment
  JEPS94219  Microseris douglasii subsp. douglasii Vernon Oswald and Lowell Ahart 1998-5-7 8999 Colusa Bartlett Springs Road 2.1 mi w of Bear Valley Road (0.8 mi e of Sawtelle Valley and Grapevine Flat Roads); Bartlett Springs Road 524 Comment
  UCD57108  Microseris douglasii subsp. douglasii Gordon Harrington; Diana Hickson 2007-4-7 0021 Colusa Colusa Co. Ca. BLM Payne Ranch, SW intersection of Hwy 16 and Hwy 20, approx. 1/5 to 1/2 mile W of Roadkill Cafe on old fuel break. 442 Comment
  UCD57294  Microseris douglasii subsp. douglasii Ellen Dean; C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3665 Colusa BLM Payne Ranch. Near origin of Craig Canyon. West of Hwy. 16, ca. 2 road miles south of junction of Hwy. 20 and Hwy. 16. 359 Comment
  CAS-BOT-BC348830  Microseris douglasii subsp. douglasii K. Curran 1889-4-1 s.n. Colusa Unspecified Comment
  JEPS86634  Microseris nutans L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6694 Colusa near road w Summit Springs (sw flank Snow Mountain); Colusa-Lake County Line, sw flank Snow Mountain 1550 Comment
  UCR261654  Microseris paludosa Ann Howald 2003-4-24 2322 Colusa Inner North Coast Ranges, Indian Valley, west side of East Park Reservoir, near Pinto Point camping area 368 Comment
  CHSC70969  Microseris sylvatica Vernon Oswald; Lowell Ahart 1998-5-7 8991 Colusa Lodoga-Leesville Rd. 4.3 mi south of Cooks Spring Rd. Roadcut. 469 Comment
  CHSC89880  Microseris sylvatica B. Castro; L. Janeway 2001-5-10 1249 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Near dirt road paralleling N-S-trending perennial creek, at the blue oak-grassland edge on moderately steep E-facing slope 405 Comment
  UCD64436  Microsteris gracilis Craig D. Thomsen 2000-3-31 2068 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  JEPS80113  Mimulus breweri L. R. Heckard with J. Hickman 1980-7-1 5272 Colusa cirque se East Peak (ca. 10 mi w of Stonyford); Snow Mt. 1950 Comment
  JEPS80380  Mimulus floribundus L. R. Heckard and J. Hickman 1981-6-22 5613 Colusa Dark Hollow Creek Snow Mt. 1889 Comment
  JEPS80382  Mimulus guttatus L. R. Heckard and J. Hickman 1981-6-22 5615 Colusa Dark Hollow Creek Snow Mt. 1889 Comment
  UCD82521  Mimulus guttatus Craig Thomsen; G. Harrington 2009-5-12 2878 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 713 Comment
  UCD82574  Mimulus guttatus Craig Thomsen 2008-6-12 2765 Colusa Bear Creek (formerly Payne) Ranch. South side of Hwy 20, ca. 0.25 mi W of Hwy 16. West and SW of the corral that is located at the junction of Hwy 16 and 20. Comment
  UC1049541  Mimulus kelloggii Rimo Bacigalupi 1950-4-16 3105 Colusa vicinity Colusa-Glenn County line (ridge above Red Bridge Camp and the confluence of the North amd Middle Forks of Stony Creek); Inner North Coast Ranges, Mendocino National Forest 579 Comment
  UC1191131  Mimulus microphyllus Herbert L. Mason 1953-5-5 14519 Colusa 0.25 above junction of Little Stoney Creek and Trout Creek (at sharp bend in road); Little Stoney Creek drainage Comment
  UC725827  Mimulus microphyllus A. A. Heller 1942-5-29 16482 Colusa 1/2 mi w Highway #16 (along State Highway #20) Comment
  JEPS7899  Mimulus nudatus Milo S. Baker 1953-5-11 12651 Colusa near Lake-Colusa Line (Hiway 20) Comment
  UC1010390  Mimulus nudatus Milo S. Baker 1953-5-11 12651 Colusa near Lake-Colusa Line (Hiwy 20) Comment
  UC886310  Mimulus nudatus Alice Eastwood, John Thomas Howell 1938-5-16 5636 Colusa on road to Williams (Lake-Colusa county line) Comment
  CDA41832  Mimulus pilosus L. Ahart 2006-8-9 13113 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. Comment
  JEPS108907  Mimulus pilosus Lowell Ahart 2006-8-9 13105 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 422 Comment
  POM21051  Mimulus pilosus Roxana Stinchfield 1916-7-9 423 Colusa Philip's Ranch, near Sycamore. Comment
  UC71770  Mimulus pilosus H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CAS-BOT-BC388583  Minuartia douglasii Annetta Carter 1938-5-7 1377 Colusa Comanche Hills, 4 miles north of Rumsey, Inner North Coast Range 259 Comment
  CHSC77926  Minuartia douglasii Beth Hendrickson; Jean Witzman 1999-4-7 Colusa Vicinity of Antelope Valley, Funks Creek, and Logan Ridge. 152 Comment
  UC1613426  Minuartia douglasii Charles M. Belshaw 1937-4-25 2876 Colusa vicinity of Cook's Spring (Devil's Ridge); Inner N. Coast Range, Devil's Ridge Comment
  UCD66610  Minuartia douglasii Craig D. Thomsen 2000-5-11 2283 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  JEPS73512  Minuartia nuttallii subsp. gregaria L. R. Heckard 1972-7-10 3130 Colusa overlooking and 3 mi nw Fouts Springs (promontory on se corner); Snow Mt. 1828 Comment
  CHSC92630  Minuartia nuttallii var. gregaria D. Isle 1999-7-14 1287 Colusa Mendocino National Forest--North Coast Ranges. Middle Fork Stony Creek Watershed. Approx. 1/3 mile below jct. 16N18/16N03 (1/4 mi. below Lake/Colusa Co. Line in Colusa Co. GPS: 10S 0522970 E 4347039 N; Spr 25' South. 1688 Comment
  JEPS61324  Mirabilis greenei W. L. Jepson 1932-5-8 16299 Colusa n of Stonyford (w Colusa County) 365 Comment
  UC71771  Mollugo verticillata H. P. Chandler 1905-9-14 Colusa Princeton Comment
  CHSC48491  Monardella odoratissima subsp. pallida Vernon Oswald 1984-7-20 1611 Colusa Near the Lily Pond n of Letts Lake in the Mendocino National Forest. 1280 Comment
  UCD67691  Monardella sheltonii D. Sanchez-Mata 1996-6-27 s.n. Colusa Williams, Blue Ridge, Bear Creek. 320 Comment
  CAS-BOT-BC220676  Monardella villosa A. A. Heller 1916-6-6 12355 Colusa Coast Range on the grade about 3 miles west of Leesville Comment
  CHSC83196  Monardella villosa D. Sanchez-Mata 1996-6-27 Colusa Williams. Blue Ridge. In Bear Creek. Comment
  CHSC48492  Monardella villosa subsp. villosa Vernon Oswald 1986-6-30 2172 Colusa Fouts Spring Rd. (M10) at Candy Bucket Spring, 6.0 mi w of Rd. 306, 0.4 mi e of jct. John Smith Rd. (M5). 609 Comment
  HSC96822  Monardella villosa subsp. villosa L. Ahart 2006-6-11 12672 Colusa E side of an off road trail (Trail 30), about 100 yards S of Fouts Rd., about 5 mi. W of Stonyford 613 Comment
  UCD81712  Monardella villosa subsp. villosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5718 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  UCD82537  Monardella villosa subsp. villosa Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5690 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 817 Comment
  CAS-BOT-BC349577  Monolopia major Ethel Crum 1938-5-8 2035 Colusa Bear Valley, four miles south of Leesville 426 Comment
  JEPS34944  Monolopia major R. F. Hoover 1938-4-24 3223 Colusa Venado Comment
  UC629741  Monolopia major Ethel Crum 1938-5-8 2035 Colusa 4 mi s Leesville; Bear Valley 426 Comment
  UCD163879  Monolopia major Craig D. Thomsen 2002-3-27 2574 Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  UCD82631  Muhlenbergia asperifolia Jack Alderson 2009-8-6 27 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of junction of Hwys 16 and 20. Near confluence of Craig and Bear Creeks. 304 Comment
  CHSC89832  Muhlenbergia filiformis B. Castro; L. P. Janeway, S. Innecken 2001-3-28 1213 Colusa Vicinity of Sites in rolling hills near Sulphur Gap, among unnamed tributaries to Lurline Creek, in heavily grazed annual grassland E of blue oak savanna. 91 Comment
  CHSC29715  Muilla maritima K. R. Stern 1980-6-1 6642 Colusa South central border area of Colusa National Wildlife Refuge. 45 Comment
  CHSC89830  Muilla maritima B. Castro; S. Innecken 2001-3-20 1216 Colusa Vicinity of Maxwell, Golden Gate in Logan Ridge, Funks Reservoir, and the Glenn-Colusa canal. 39 Comment
  CAS-BOT-BC514196  Muilla maritima Roxana S. Ferris 1917-4-12 501 Colusa 4 miles east of Williams Comment
  CAS-BOT-BC83269  Myosurus minimus Roxana S. Ferris 1917-4-10 510 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC83271  Myosurus minimus Roxana S. Ferris 1917-4-10 507 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC83273  Myosurus minimus Roxana S. Ferris 1918-4-10 1443 Colusa 4 miles east of Williams. Comment
  CAS-BOT-BC83274  Myosurus minimus Herbert L. Mason 1953-4-5 14508 Colusa Three miles east of Maxwell. Comment
  CAS-BOT-BC83283  Myosurus minimus James Jokerst 1986-5-6 2300 Colusa Near Lurline Creek. 41 Comment
  UC1101350  Myosurus minimus Herbert L. Mason 1953-4-5 14509 Colusa 3 mi e of Maxwell Comment
  UC1114806  Myosurus minimus Donald E. Stone Oct 26 1954-Sep 18 1955 7 -13 Colusa 3 mi e of city of Maxwell (on the Maxwell Road) Comment
  CAS-BOT-BC83281  Myosurus minimus Alice Eastwood 1922-4-24 11188 a Colusa Road between Princeton and Norman. Colusa/Glenn county line. Comment
  UC1101351  Myosurus sessilis Herbert L. Mason 1953-4-5 14508 Colusa 3 mi e of Maxwell Comment
  UC1114812  Myosurus sessilis Donald E. Stone Dec 8 1956-Apr 13 1957 26 -7 Colusa 3 mi e of the city of Maxwell (on the Maxwell Road); Maxwell Road Comment
  CHSC117595  Myriophyllum spicatum B. Castro; D. Bogener, A Lyons 2007-11-13 1684 Colusa Sacramento Valley. Vicinity of Golden Gate on E side of Logan Ridge, at SE corner of Funks Reservoir, within surrounding grassland. 60 Comment
  UCR227337  Najas graminea Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5106 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon 511 Comment
  UC1100011  Najas guadalupensis Herbert L. Mason, Verne Grant 1946-9-5 13120 Colusa 1.6 mi w of Williams (Road to Lake County) Comment
  CAS-BOT-BC456162  Najas guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa Two miles west of Colusa on Williams highway by bridge Comment
  UCD138157  Najas guadalupensis subsp. guadalupensis Herbert L. Mason; Verne Grant 1946-8-15 13008 Colusa 2 miles west of Colusa on Williams highway by bridge. Comment
  UC1146671  Nassella cernua Freed W. Hoffman 1944-7-13 1957 Colusa between Indian Valley and Bear Valley; North Coast Ranges Comment
  UCD57857  Nassella cernua Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 44 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Along Thompson Creek, upstream (west of) Road Kill Cafe. On a terrace at the confluence of Thompson Creek and a tributary, approximately 3/4 mile upstream from the breached dam near Road Kill Cafe. 413 Comment
  CHSC85970  Nassella pulchra Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  CHSC88537  Nassella pulchra B. Castro 2003-5-15 1441 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Upper and mid-slope on steep E-facing side of S-trending canyon. 213 Comment
  UCD87543  Nassella pulchra Freed W. Hoffman 1942-4-23 2253 Colusa Near Maxwell. Comment
  UC908879  Navarretia heterandra Herbert L. Mason 1946-5-30 12816 Colusa near Eppersons; Bear Valley Comment
  JEPS81285  Navarretia intertexta L. R. Heckard and J. C. Hickman 1982-7-5 5896 Colusa Summit Springs, south side of Snow Mt. 457 Comment
  JEPS80763  Navarretia intertexta L. R. Heckard and J. C. Hickman 1981-7-30 5730 Colusa 182 Comment
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May 28 2012
  CHSC69683  Navarretia intertexta subsp. intertexta Vernon Oswald 1984-7-23 1617 Colusa Lily Pond near Letts Lake in Mendocino National Forest. On a road along the edge of a meadow. 1280 Comment
  CHSC84247  Navarretia jepsonii Lowell Ahart 2003-7-14 10385 Colusa Field on the south side of Highway 20, about 2 miles southwest of the intersection of Highway 20 and Bear Valley Road, about 21 miles (by road) southwest of Williams. 520 Comment
  UCD164150  Navarretia jepsonii Craig Thomsen 2000-5-12 2328 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCR197901  Navarretia jepsonii Calvin McMillan, Beecher Crampton (494F) 1949-9-25 s.n. Colusa 18 miles east of Bartlett Springs Comment
  UCR261754  Navarretia jepsonii Ann Howald 2003-5-31 2360 Colusa Inner North Coast Ranges, Indian Valley, east side of East Park Reservoir, c. 3 miles north of Lodoga, ridge west of Serenity camping area 373 Comment
  CAS-BOT-BC230318  Navarretia jepsonii A. A. Heller 1940-6-7 15709 Colusa 7 miles N of Stonyford Comment
  CHSC107978  Navarretia leucocephala subsp. leucocephala B. Castro; Robin Carter, Jessica Boyt 2011-4-25 1854 Colusa Sacramento Valley. Extreme west edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi southeast of Funks Reservoir and 0.3 mi northeast of Tehama-Colusa Canal. Towards north end of vernally moist swale which extends northeast of large +- saline/alkaline wetland/marsh, in drying vernapool bottom. 49 Comment
  UCD84439  Navarretia mellita Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6049 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  UCR225393  Navarretia nigelliformis Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5082 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwestern part of ranch, along trail that follows the border of Lake and Colusa counties. South of junction with trail that heads down to the headwaters of Thompson Creek 429 Comment
  CHSC79545  Navarretia nigelliformis subsp. nigelliformis B. Castro; L. P. Janeway 2000-5-1 1103 Colusa Vicinity of Sites, hills S of the Sites-Lodoga Rd, and Grapevine Creek. 204 Comment
  UCD58121  Navarretia nigelliformis subsp. nigelliformis Ellen Dean; PLB 102 Class 2007-4-29 3717 Colusa Payne Ranch. West of Hwy. 16. Ca. 2 road miles S of junction of Hwy. 20 and Hwy. 16. Through Craig Canyon. Above Thompson Creek. 381 Comment
  UCD63775  Navarretia nigelliformis subsp. nigelliformis Craig D. Thomsen 2008-5-31 2756 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Cowboy Camp area, west side of Hwy 16, 1 mile south of Hwy 20. In meadow, west of public viewing area between Bear Creek and hillslopes to the west. 279 Comment
  UCD63739  Navarretia pubescens Craig D. Thomsen 2008-5-23 2745 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. About 1 mile south of Hwy 20 (south of Destanella Flat) and 2.5 miles west of Hwy 16. 415 Comment
  CHSC89877  Navarretia tagetina B. Castro; L. Janeway, S. Innecken 2001-5-9 1246 Colusa Vicinity of Grapevine Creek, Antelope Creek, and Pence Mtn. Along dirt road paralleling N-S-trending perennial creek. 365 Comment
  UC1618098  Navarretia viscidula Donald G. Nelson 1940-6-9 Colusa Stoneyford Comment
  JEPS22942  Nemacladus capillaris Volney Rattan 1884-1 Colusa above Stony Creek Comment
  UC1585893  Nemacladus capillaris Barbara Ertter 1989-7-1 8599 Colusa ca 12 air mi wsw Stonyford (road to Goat Mt. Lookout, 2.2 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); Stony Creek 1500 Comment
  UCD82741  Nemacladus montanus Craig Thomsen; G. Harrington 2009-5-14 2922 Colusa Colusa County on Walker Ridge: southeast of Methany flat. 579 Comment
  SBBG126069  Nemophila heterophylla G. K. Helmkamp with E. A. Helmkamp 2009-3-11 14372 Colusa St Hwy 20, 14.3 mi SW of Williams 375 Comment
  UC606895  Nemophila heterophylla L. Constance 1938-4-22 2146 Colusa Lower Lake-Williams Rd 4 mi e Lake-Colusa LIne (on Cache Creek near Wilbur Springs); Inner North Coast Ranges, Cache Creek nr Wilbur Springs 365 Comment
  UCD56937  Nemophila heterophylla Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3539 Colusa BLM Payne Ranch. Southwest of intersection of Hwy. 16 and Hwy. 20. Thompson Canyon. 344 Comment
  UCD66587  Nemophila heterophylla Craig D. Thomsen 2000-4-12 2158 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC110841  Nemophila heterophylla David Isle 1989-4-14 2010 Colusa Stony Creek Watershed. Charlotte Roush Ranch, S of Cook Springs Road. Comment
  HSC87763  Nemophila menziesii Stephen Westergaard 1967-4-29 12 Colusa Bear Valley, 5 mi. N of Hwy. 20 91 Comment
  JEPS94183  Nemophila menziesii var. menziesii Vernon Oswald and Lowell Ahart 1998-4-21 8949 Colusa Rd. 401 1.8 mi. n. Grapevine Pass (on the Sites-Lodoga Rd.) 472 Comment
  UCD66962  Nemophila parviflora Ellen Dean; Davis Botanical Society 2008-5-31 5006 Colusa west of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground. 1311 Comment
  UCR228648  Nemophila parviflora Ellen Dean, Davis Botanical Society 2008-5-31 5006 Colusa West of I-5 at Maxwell, east slope of Goat Mountain, along Goat Mountain Road, Cedar Grove Campground 1312 Comment
  CDA16097  Nemophila pedunculata G. F. Hrusa 1999-5-16 15046 Colusa North Coast Ranges; Summit of Goat Mtn on N side, on road to Young's Corral, +/- 1/4 mi N of intersection to Goat Mtn Lookout. 1706 Comment
  CHSC62938  Nemophila pedunculata Vernon H. Oswald; Lowell Ahart 1994-4-6 6076 Colusa Goat Mtn. Rd. 0.3 mi S of Little Stony Creek Bridge, SW of Digger Pine Flat, SSW of Stonyford. 548 Comment
  HSC66134  Nemophila pedunculata C. Macdonald, P. Powers, C. Raley, J. Spitler, D. Stamp 1980-4-19 42 Colusa On Bartlett Springs Rd. at stream crossing Comment
  JEPS80381  Nemophila pedunculata L. R. Heckard and J. Hickman 1981-6-22 5614 Colusa along Dark Hollow Creek (Big Meadow, Snow Mt.); Snow Mt., , Big Meadow 1889 Comment
  UC595048  Nemophila pedunculata Annetta Carter 1938-5-8 1381 Colusa 6.6 mi s Lodoga; s of Lodoga Comment
  UC638658  Nemophila pedunculata Ethel Crum 1938-5-8 2025 Colusa 3 mi n Leesville; Inner North Coast Range Comment
  UCD119932  Nemophila pedunculata J. M. Tucker; Ted Niehaus 1960-4-3 3584 Colusa 9.1 miles above State Highway 20, Bear Valley (Wilbur Springs) Road. Comment
  UC38962 Image available Neostapfia colusana J. Burtt Davy 1898-5-26 Colusa near Princeton; ; Princeton, Colusa Co. Comment
  JEPS120705  Nicotiana acuminata var. multiflora Lowell Ahart 2013-10-1 19084 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  UC71879  Nicotiana acuminata var. multiflora H. P. Chandler 1905-9-14 Colusa Princeton Comment
  SEINET11587905  Nicotiana glauca Unknown 2009-3-11 14379 Colusa Williams Comment
  CHSC94439  Nicotiana quadrivalvis Lowell Ahart 2006-8-9 13141 Colusa North side and west of the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UC199530  Nicotiana quadrivalvis H. M. Hall 1917-4-29 10286 Colusa 5 mi n Colusa (Sacramento River banks); Sacramento River Comment
  CAS-BOT-BC400054  Nuphar polysepala F. P. Cronemiller 1924-6-26 892 Colusa Upper Letts Swamp 1371 Comment
  CHSC71441  Orobanche californica subsp. jepsonii Vernon H. Oswald; Lowell Ahart 1998-7-15 9274 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. Along the edge of a meadow. 524 Comment
  UCD84573  Orobanche fasciculata Ellen Dean; C. Thomsen, G. Harrington, Davis Botanical Society 2010-6-5 6098 Colusa Walker Ridge on border of Lake and Colusa counties. Just E of Barrel springs area along Walker Ridge Road. 721 Comment
  JEPS81407  Orobanche pinorum L. R. Heckard and J. C. Hickman 1982-7-9 6014 Colusa Colusa-Lake County Boundary: Near junction of Horse Glade along road to Lookout, Goat Mt. Comment
  UC71779  Orobanche vallicola H. P. Chandler 1905-10-1 Colusa Princeton Comment
  CAS-BOT-BC502948  Orobanche vallicola Roxana Stinchfield 1916-7-12 475 Colusa Sycamore Slough Comment
  CAS-BOT-BC238372  Orthocarpus Wayne Roderick 1967-5-7 s.n. Colusa Bear Valley 304 Comment
  RSA402037A  Orthocarpus lithospermoides Jens Clausen 1935-5-20 1018 Colusa Ca. 27 mi W of Williams after having passed the Wilbur Springs road. Along Bear Creek. Comment
  POM298007  Orthocarpus lithospermoides var. bicolor A. A. Heller 1919-5-10 13116 Colusa W of Leesville. Comment
  UCD88428  Oryza rufipogon P. B. Kennedy 30-31 May 1922 s.n. Colusa Cortina. Comment
  UCD57070  Oryza sativa Beecher Crampton 1963-9-9 6894 Colusa 1/4 mile E of Cortena. Comment
  JEPS73443  Osmorhiza occidentalis L. R. Heckard 1972-7-8 3038 Colusa near summit ridge se West Peak (Lake-Colusa Co. boundary); Snow Mt. 2072 Comment
  CAS-BOT-BC316836  Packera clevelandii Dennis E. Breedlove 1963-5-30 5182 Colusa 17 miles E of Bartlett Springs Comment
  CHSC88558  Packera clevelandii L. P. Janeway 2001-6-6 7117 Colusa Inner North Coast Ranges. Malaney Flat, about 4.8 km (air) east of Walker Ridge Road. Large open meadow. 610 Comment
  CAS-BOT-BC231236  Packera eurycephala var. eurycephala Roxana Stinchfield Ferris 1926-4-23 6454 Colusa Stonyford. Comment
  CHSC70785  Packera eurycephala var. eurycephala B. Castro; D. Isle, L. Hanson, L. Janeway 1995-4-28 565 A Colusa Stonyford area, along the west bank of Salt Creek, beginning ca 20 yds N of Dennis Drive, extending into fenced field to the W and into property to the N of field. 371 Comment
  JEPS118687  Packera eurycephala var. eurycephala David Isle 2011-5-8 1902 Colusa E of Isle home, concen. W of E fenceline. 2253 Dennis Dr, Stonyford in W 5 Ac of S 1/2 of NW 1/4 of SW 1/4 of SE 1/4. Gilmore Peak 7.5' quad. Comment
  UCD66540  Packera greenei Craig D. Thomsen 2001-5-24 2518 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC94428  Panicum capillare Lowell Ahart 2006-8-22 13222 Colusa South side of Stony Creek, about 100 yards west of the bridge across Stony Creek, just north of Stonyford. 349 Comment
  UCD32923  Panicum capillare subsp. hillmanii Beecher Crampton 1965-7-8 7446 Colusa Colusa County, 1 mile south of Sycamore. Comment
  UCD89786  Panicum capillare subsp. hillmanii Beecher Crampton 1969-6-18 8457 Colusa 1.5 miles south of Williams. Interstate Hwy. 5 northbound. Comment
  POM313202  Panicum dichotomiflorum H. L. Mason 1945-9-19 12720 Colusa Below caus[e]way over Butte Sink spillway, East bank of Sacramento River, 1 mile north of Colusa. Comment
  CAS-BOT-BC253937  Parapholis incurva Beecher Crampton 1958-5-19 4825 A Colusa Along US Highway 99W, 4 miles S of Maxwell Comment
  SEINET238367 Image available Parapholis incurva Beecher Crampton 1953-4-29 1143 Colusa 2 miles east of Maxwell. Comment
  UCD66918  Paspalum distichum Craig D. Thomsen; G. Harrington 2008-7-6 2780 Colusa BLM Payne Ranch. Lands to the SW of the jct of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek canyon. Along ridge trail. 510 Comment
  UCD67080  Paspalum distichum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5104 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  UC1613496  Pectocarya penicillata Charles M. Belshaw 1937-4-25 2840 Colusa vicinity of Cook's Spring (Inner North Coast Ranges, Devil's Ridge); Inner North Coast Ranges, Devil's Ridge Comment
  JEPS87667  Pectocarya pusilla Vernon H. Oswald and Lowell Ahart 1994-4-6 6071 Colusa s. Stonyford (Goat Mtn. Road 0.8 mi s. of Sullivan Creek Bridge, sw of Digger Pine Flat) 487 Comment
  RSA0060516  Pedicularis densiflora Richard R. Halse 2014-3-25 9035 Colusa Along the Bear Valley Road ca. 1.8 miles west northwest of its junction with State Hwy. 20. 378 Comment
  UCD165931  Pedicularis densiflora Ellen Dean; with Tom Starbuck 2016-4-24 8842 Colusa BLM Bear Creek Ranch (formerly Payne Ranch). Lands to the southwest of the intersection of Highway 16 and Highway 20. On north-facing slope of knoll that is just south of corral area (corral at junction of Highways 16 and 20). 398 Comment
  HSC62929  Pedicularis densiflora Kenneth Clark 1979-4-14 92 Colusa 1067 Comment
  RSA589938  Pedicularis densiflora Michael A. Vincent, Robert M. Rhode 1996-3-30 7304 Colusa Along Brim Road, 2.9 mi W jct Bear Valley Rd. Comment
  UCD84548  Pediomelum californicum Ellen Dean; C. Thomsen, T. Hansen, and windfarm meeting 2010-6-11 6146 Colusa Walker Ridge. Along Walker Ridge Road, N of turnoff to Indian Valley Reservoir but S of Til Jones Spring. Many old undeveloped roads here. 817 Comment
  JEPS86609  Pellaea brachyptera L. R. Heckard with P. C. Silva, R. L. and M. Moe 1988-6-19 6713 Colusa 0.5 mi. n.e. Summit Springs (s.w. flank of Snow Mt.); Colusa-Lake Co. Line, Snow Mt. 1650 Comment
  HSC72153  Pellaea mucronata J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9566 Colusa Bear Valley Rd. 2.1 mi. from its jct. with Hwy. 20 366 Comment
  UC1212587  Penstemon heterophyllus Francia Chisaki, Helen K. Sharsmith 1959-5-26 1330 Colusa on road to Red Bridge Camp at North Fork of Stony Creek crossing; Inner North Coast Ranges, North Fork Stony Creek Comment
  SEINET12327201  Penstemon heterophyllus C. C. Freeman, Wetter, M. A. 1983-1 1891 Colusa 2.2 mi NNE of the jct of CA 20 & 16 in the foothills of the Sierra Cascades Comment
  HSC67100  Penstemon heterophyllus subsp. purdyi S. Harris, B. Ferguson, M. Smith, M. Moble 1980-4-19 Colusa Leesville Rd., road from Leesville to Williams, 3.8 mi. E of Leesville Comment
  UCR206380  Penstemon heterophyllus subsp. purdyi George K. Helmkamp, E. A. Helmkamp 2009-5-20 14756 Colusa Inner North Coast Ranges, along CA-16, 1.8 miles north of the Yolo County line 271 Comment
  POM231095  Penstemon heterophyllus subsp. purdyi Jens Clausen 1935-5-20 1015 Colusa 18 mi W of Williams on Bartlett Springs Road. Past the Stonyford road. Comment
  JEPS7560  Penstemon heterophyllus var. heterophyllus W. L. Jepson 1920-3-23 8963 Colusa Mountainside above Venado (sw Colusa Co.); Mountainside above Venado Comment
  NY601765  Penstemon heterophyllus var. purdyi A. A. Heller 1919-5-10 13118 Colusa Valley west of Leesville Comment
  CHSC42649  Perideridia howellii Vernon Oswald 1986-6-30 2180 Colusa Mill Valley Campground near Letts Lake and Lily Pond. 1188 Comment
  UC875337  Perideridia kelloggii A. A. Heller 1916-6-6 12361 Colusa grade about 3 mi w Leesville; Coast Range Comment
  UCD63128  Perideridia kelloggii Ellen Dean; G. Harrington, C. Thomsen, S. Harrison 2008-5-18 4958 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Meadow to the east of Destinella Flat, ca. 3 rd miles west of the junction with Hwy 16 on the south side of Hwy 20. 526 Comment
  JEPS127597  Perideridia kelloggii David Isle with Frank Pendell 2014-6-16 2135 Colusa About 2 miles W of Stonyford on the Pendell Ranch. SE of the home of Frank and Sheri Pendell about 1/4 mile and NW of the Stonyford cemetery about 200 yards. Comment
  JEPS80375  Perideridia oregana L. R. Heckard and J. Hickman 1981-6-22 5608 Colusa East Peak Snow Mt. (s side of e ridge) 1950 Comment
  CHSC107483  Persicaria amphibia Jeanne Pendell 2010-7-17 1918 Colusa Mendocino National Forest - North Coast Ranges Middle Fork Stony Creek Watershed. East arm of East Park Reservoir, in the lake. 365 Comment
  CHSC94442  Persicaria maculosa Lowell Ahart 2006-8-9 13132 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  CHSC94698  Persicaria maculosa Lowell Ahart 2006-9-26 13354 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell. 24 Comment
  HSC47736  Petrorhagia dubia Thomas W. Nelson, Jane P. Nelson 1978-4-29 3942 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  UC73691  Phacelia ciliata var. ciliata Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  CHSC32769  Phacelia corymbosa James Jokerst 1980-6-27 923 Colusa Near Frenzel Creek Botanical Area. 609 Comment
  UC1228357  Phacelia corymbosa L. R. Heckard and G. T. Robbins 1956-7-24 816 Colusa about 1/2 mi s summit; Snow Mountain 2042 Comment
  JEPS95504  Phacelia distans Vernon H. Oswald and L. Ahart 1994-3-23 6021 Colusa T16N R7W NE1/4 NW1/4 Sec. 1, 1660 ft, Chaparral. Goat Mtn. Rd. just W of the bridge over Sullivan Creek, S of Stonyford 505 Comment
  RSA794842  Phacelia distans D. Isle 2008-4-9 1934 Colusa Reese Place Duck Club (4498 2 Mile Road); approx. 4 miles northeast of Maxwell. 30 Comment
  UCR212377  Phacelia divaricata Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4668 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Slopes to the NW of Cowboy Camp on the west side of Bear Creek 358 Comment
  CHSC32215  Phacelia egena James Jokerst 1980-8-6 1058 Colusa Near Snow Mountain (West). Comment
  UC901824  Phacelia egena L. Constance, R. Bacigalupi, C. R. Bell, and A. H. Holmgren 1950-4-26 3320 Colusa road cut 1 mi se Sites; Stone Corral Creek 76 Comment
  SD58509  Phacelia egena L. R. Heckard, C. R. Bell 1951-6-14 176 Colusa West facing serpentine slope near Stonyford. Comment
  UC1051762  Phacelia egena L. R. Heckard 1953-4-12 S- 136 Colusa University of California Botanical Garden Comment
  SEINET7096745  Phacelia heterophylla subsp. virgata A. G. Vestal 1955-4-5 s.n. Colusa Steep south of facing bank ca. 1/3 mile into Colusa National Wildlife Refuge on Route 20.NAD27, 39? deg. 09' 09ao, -122?_ 11ao (converted to WGS84 decimal degrees) UTM Zone 10, 570301mE, 4333799mN. Comment
  UCD66695  Phacelia imbricata Craig D. Thomsen 2000-6-23 2381 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  CHSC60747  Phacelia imbricata subsp. imbricata Vernon H. Oswald; Lowell Ahart 1993-5-27 5430 Colusa Sites-Lodoga Rd. ca. 0.4 mi W of Grapevine Pass (4.6 road mi E of Lodoga). 481 Comment
  CHSC79767  Phacelia imbricata subsp. imbricata L. P. Janeway; B. Castro 2000-5-2 6696 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 231 Comment
  HSC44464  Phacelia tanacetifolia R. York 1978-4-22 141 Colusa Bear Valley Rd., 1.5 mi. from its junction with S.R. 20 409 Comment
  HSC45748  Phacelia tanacetifolia Stephen Plant 1978-4-23 228 Colusa 2.5 mi. from Hwy. 20 on bear Valley Rd. 419 Comment
  POM163459  Phacelia tanacetifolia Roxana S. Ferris 1926-4-23 6407 Colusa Grade beyond the Mountain House on the Williams-Stonyford Road. Comment
  UCD82733  Phacelia tanacetifolia Craig Thomsen; G. Harrington 2009-5-14 2914 Colusa Colusa County on Walker Ridge: south of spur road about 1/2 mile east of Walker Ridge Road, en route to Eaton Springs. 762 Comment
  CDA32827  Phacelia tanacetifolia P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  UCD82490  Phalaris aquatica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5676 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 843 Comment
  UCD88035  Phalaris aquatica Beecher Crampton 1963-8-5 6869 Colusa 1/4 mile E of Cortena. Comment
  UCR225399  Phalaris aquatica Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5100 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon, just south of junction with trail that leads east to Brophy Canyon and Thompson Creek 488 Comment
  UCR227636  Phalaris aquatica Craig D. Thomsen, Gordon Harrington 2008-7-6 2779 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 20 and 16. Western edge of ranch on ridge above Cache Creek Canyon, along ridge trail 511 Comment
  UCD88339  Phalaris brachystachys Beecher Crampton 1961-7-20 5936 Colusa 8 miles SE of Grimes. Comment
  CAS-BOT-BC265956  Phalaris minor Roxana S. Ferris 1917-4-12 508 Colusa 4 miles east of Williams Comment
  UCD89177  Phalaris minor Hursh 1919-1 X 3340 Colusa Williams. Comment
  POM207817  Phalaris paradoxa Jos Burtt Davy 1898-05 s.n. Colusa Near Princeton. Comment
  UCR206810  Phlox gracilis George K. Helmkamp, E. A. Helmkamp 2009-3-17 14389 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  RSA0115434  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley: along CA-20 at the junction with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian. 20 Comment
  UCR257578  Phoradendron macrophyllum George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22508 Colusa Sacramento Valley, along CA-20 at the junction with Alameda Court, 0.2 mile west of the Sacramento River crossing at Meridian 20 Comment
  JEPS80242  Phoradendron villosum L. R. Heckard and J. Hickman 1980-7-3 5403 Colusa near Summit Springs (Snow Mt.); Snow Mt. Comment
  UC1124395  Phyla caespitosa H. S. Yates 1936-8-14 6134 Colusa 3 mi S of Colusa 15 Comment
  UC727675  Phyla lanceolata Milo S. Baker 1946-9-3 11622 Colusa near locked gate Colusa Gun Club (Butte Sink); Butte Sink Comment
  UCD72398  Phyla nodiflora Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5123 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Confluence of Cache and Bear Creeks at southern tip of ranch. 198 Comment
  UCD13212  Phyla nodiflora Charles Martin 1986-5-17 26 Colusa California: Colusa County. Along Maxwell-Sites Rd., 0.95 mi E of Sites, along roadside. Comment
  CHSC60924  Phyla nodiflora var. rosea Vernon H. Oswald 1993-6-23 5571 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, near the S side of Cell 2, Pool 10. 21 Comment
  CHSC80450  Physalis lancifolia Caroline Warren; Jenny Marr, Heidi West 1998-7-1 Colusa Vicinity of Peterson Road and Funks Creek. 91 Comment
  UC1561070  Physalis lancifolia Dean W. Taylor 1989-8-4 10419 Colusa Colusa National Wildlife Refuge Great Central Valley (along Ohm Road) 39 Comment
  CDA5824  Physalis lancifolia Cowley Jul 1931 Colusa West of Colusa. 0 Comment
  CAS-BOT-BC76959  Pilularia americana G. Thomas Robbins; S. Galen Smith 1950-4-15 1905 Colusa Bear Valley Comment
  CHSC94297  Piptatherum miliaceum Lowell Ahart 2006-8-9 13106 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  UCD63621  Piptatherum miliaceum Craig D. Thomsen 2000-6-12 2371 Colusa BLM Payne Ranch. Southwest of intersection of Hwy 16 and Hwy 20. Between Cache Creek Ridge and Brophy Canyon, about 5 miles south of Hwy 20 and 1.5 miles west of Hwy 16. 321 Comment
  UCD72389  Piptatherum miliaceum Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5115 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Southwestern edge of ranch above Cache Creek Canyon along ridge trail. 548 Comment
  CHSC107949  Pisum sativum B. Castro; T. Boullion 2011-4-20 1847 Colusa Sacramento Valley. Extreme W edge of Sacramento Valley; ca 5 air mi NW of Maxwell, 0.8 mi SE of Funks Reservoir and 0.3 mi east of bend in Tehama-Colusa Canal. In grassy uplands north of large +- saline/alkaline wetland/marsh and associated vernal swales, just south of east-west fence bordering grain fields. 49 Comment
  CAS-BOT-BC227985  Plagiobothrys Roxana S. Ferris 1926-4-21 6295 Colusa 3 miles W of Colusa Comment
  CHSC81227  Plagiobothrys bracteatus Caroline Warren; Joyce Lacey-Rickert 1998-5-8 Colusa Vicinity of Sites and Antelope Creek. 91 Comment
  CHSC79098  Plagiobothrys canescens B. Castro; C. Warren 2000-4-3 1046 Colusa Vicinity of Antelope Valley, Sites-Lodoga Rd, and Grapevine Ck. 173 Comment
  CHSC86878  Plagiobothrys canescens B. Castro 2003-3-28 1406 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Stone Corral Creek. 256 Comment
  SBBG126070  Plagiobothrys canescens G. K. Helmkamp with E. A. Helmkamp 2009-5-20 14750 Colusa St Hwy 16 at "Cowboy Camp" 1.0 mi S of jct with St Hwy 20, adjacent to Bear Crk 332 Comment
  UCD57558  Plagiobothrys canescens Stephanie Castle; with Plant Biology 102 2007-4-29 1 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Meadow on the west side of State Route 16, ca. 2 road miles south of intersection with State Route 20. West side of Bear Creek, north of Craig Creek. 304 Comment
  SFV3146  Plagiobothrys canescens A. Ongun 1961-4-16 37 Colusa Bear Valley, 8 miles north of State Highway 20. Just south of wooden bridge. Comment
  JEPS68046  Plagiobothrys fulvus W. L. Jepson 1932-5-7 16258 Colusa valley above Venado 304 Comment
  UCD163215  Plagiobothrys fulvus var. campestris Craig D. Thomsen 2000-3-31 2167 Colusa Bear Creek Botanical Management Area. CalTrans right-of-way along Hwy 20 (south side), about 0.3 mile west of Hwy 20/16 intersection. 345 Comment
  CHSC29722  Plagiobothrys humistratus K. R. Stern 1980-4-1 6621 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UCD58113  Plagiobothrys humistratus Ellen Dean; G. Harrington and P. McIntyre 2007-3-16 3380 Colusa Payne Ranch. Along Hwy. 20, Destanella Flat area just E of Lake Co. border. Ca. 3.4 road miles west of junction with Hwy. 16. Along unimproved road that goes south from Hwy. 20, ca. 2.3 road miles W of junction with Hwy. 16. Unnamed valley with old building called 'Roadkill Cafe. 414 Comment
  JEPS116661  Plagiobothrys infectivus B. Castro with Robin Carter, Amy Lyons 2010-5-18 1812 Colusa Vicinity of Golden Gate in Logan Ridge, Funks Reservoir and the Tehama-Colusa canal, Eastside Road/Rd 69 extension route. Logan Ridge 121 Comment
  HSC47742  Plagiobothrys nothofulvus Thomas W. Nelson, Jane P. Nelson 1978-4-29 3947 Colusa Along Bear Valley Rd., 2.5 mi. from junction with Hwy. 20 366 Comment
  JEPS80194  Plagiobothrys nothofulvus L. R. Heckard and J. Hickman 1980-7-3 5347 Colusa ca 10 mi w Stonyford (just w of Summit Springs, sw of Snow Mt., Colusa-Lake County boundary) 1548 Comment
  UCD82471  Plagiobothrys nothofulvus Craig Thomsen; G. Harrington 2009-5-12 2849 Colusa Colusa County on Walker Ridge. Eaton Springs, about 1 mile east of Walker Ridge Rd. 707 Comment
  UCD120933  Plagiobothrys nothofulvus E. Witharm 1998-4-17 5 Colusa Bear Vly., Leesville-Lodoga Rd., 2 road miles NE from Bear Vly Rd. -- Leesville-Lodoga Rd. junction. Comment
  RSA10707  Plagiobothrys stipitatus C. B. Wolf 1928-5-8 2124 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  UC78205  Plagiobothrys stipitatus K. Brandegee Apr 1889 Colusa Colusa Junction Comment
  CHSC77923  Plagiobothrys stipitatus var. micranthus Beth Hendrickson; Natalie Wight, Heidi West 1999-3-25 Colusa Vicinity of Antelope Valley and Sites. 121 Comment
  CHSC29720  Plagiobothrys stipitatus var. stipitatus K. R. Stern 1980-4-1 6617 Colusa Vernal pool, south central border area of Colusa National Wildlife Refuge. 45 Comment
  UCR212375  Plagiobothrys stipitatus var. stipitatus Ellen Dean, Craig D. Thomsen, N. Voegtly, J. Alderson, Gordon Harrington 2008-3-30 4662 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwys 20 and 16. Near corral on west side of Bear Creek just south of Hwy 20 320 Comment
  JEPS95520  Plagiobothrys tenellus Vernon H. Oswald and L. Ahart 1994-4-6 6069 Colusa T17N R7W SE1/4 SW1/4 Sec. 36, 1540 ft, Chaparral. Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat, S of Stonyford. Occasional populations in openings in brush on the rocky slopes (serpentine) bordering Sullivan Creek. 469 Comment
  UCD97126  Plagiobothrys tenellus Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6910 Colusa Along Bear Valley Road at the Cal Fire station. 335 Comment
  CAS-BOT-BC60828  Planodes virginica L. R. Abrams 1928-5-8 12590 Colusa 2 miles south of Arbuckle. Comment
  RSA10706  Planodes virginica C. B. Wolf 1928-5-8 2125 Colusa Sacramento Valley. 3 mi. S of Arbuckle Comment
  CHSC94420  Plantago coronopus Lowell Ahart 2006-8-9 13154 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS123891  Plantago elongata Lowell Ahart 2015-4-28 20114 Colusa About 5 1/2 miles east of Maxwell. Comment
  CHSC115396  Plantago erecta Lowell Ahart 2015-4-10 20004 Colusa Along the south edge of Leesville Road, about 1/2 mile east of Leesville, about 12 miles (air) northwest of Williams. 445 Comment
  CHSC86027  Plantago erecta Jenny Marr; H. West, J. Lacey, C. Warren, N. Wight 1998-4-14 Colusa Vicinity of Grapevine Creek, Antelope Valley, and Sites-Lodoga Road. Pasture. 121 Comment
  JEPS120973  Plantago erecta Lowell Ahart, John Dittes, Josephine Guardino 2013-4-26 18632 Colusa On N side of Hwy 20, just E of Lake County Line, 12.2 air miles ENE of town of Clear Lake, 17.1 air miles W of Williams. Comment
  POM61338  Plantago erecta Roxana S. Ferris 1917-4-12 496 Colusa 4 miles east of Williams. Comment
  UCD163669  Plantago erecta Craig Thomsen 1999-4-15 1969 Colusa Bear Valley. About 7 miles north of Hwy 20. Comment
  UCD57337  Plantago erecta Diane Hickson 2007-3-25 3 Colusa BLM Payne Ranch. Destanella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD124495  Plantago erecta J. M. Tucker 1960-4-3 3583 Colusa 1/4 mile west of road, 7.5 miles above State Highway 20, Bear Valley (Wilbur Springs) Road. Comment
  UCD14370  Plantago erecta L. Coats 1983-4-24 6 Colusa in the hills at the south end of Bear Valley, along Bear Valley Road, 6.3 miles south of Bartlett Springs Road. 487 Comment
  RSA388847  Plantago erecta subsp. erecta Susan Dakuzaku 1975-4-20 28 Colusa Bear Valley Road, 9.5 miles north of State Highway 20. 404 Comment
  CAS-BOT-BC93145  Platanus racemosa Roxana S. Ferris 1917-4-17 628 Colusa Sycamore Slough. Comment
  CHSC59996  Platystemon californicus Robert Robichaux 1975-4-20 43 Colusa Wilbur Springs Road, ca. 6 miles southwest of Barrel Springs. Comment
  UCR52384  Platystemon californicus R. Earing, C. Cavanaugh, C. Collins 1987-4-12 80 Colusa Bear Valley Comment
  HSC86821  Platystemon californicus Dana J. Lenarz 1982-3-27 3 Colusa .5 km W of junction of Hwy. 20 and Hwy. 16, S side of Bear Creek, 29 km SW of Williams 322 Comment
  SEINET8794142  Platystemon californicus K. Brandegee 1889-1 s.n. Colusa Colusa Junction [now Cortena]. Comment
  UC1051694  Platystemon californicus Helen K. Sharsmith 1953-6-18 4257 Colusa above Mill Creek near Fouts Spring (Mendocino National Forest); Inner North Coast Ranges, , Mill Cr 609 Comment
  UCD68862  Platystemon californicus G. Robinson 1984-4-21 11 Colusa Bear Valley, California, 30 m. West of Wilbur Springs Road, 3.2 miles North of Highway 20. In valley grasslands - pasture forbs plant association, dominated by composites, on hard, black clay soil, in full sunlight, common in area. Solitary, upright plants. Flowers, yellow-white, 'cream cup. 390 Comment
  UCD96066  Platystemon californicus Linda Osbourne 1980-4-12 12 Colusa 0.3 mile west of junction of Highways 20 and 16, south side of Bear Creek, 16 miles SW of Williams. 321 Comment
  UCSB63724  Platystemon californicus Devanna, Martin 1987-4-4 Colusa Ca. 0.3 mi w of jct Hwys 20 and 16; S side of Bear Creek; ca. 18 mi sw of Williams; Wilbur Springs Quadrangle; S central border of Sect. 36. T14N, R5W 321 Comment
  CDA11417  Plectritis ciliosa G. F. Hrusa, K. van Katwyk 1995-4-22 12138 Colusa Inner North Coast Ranges; On S side of Leesville Rd. approx. 3 m. N of Hwy 20. Comment
  UCD137585  Plectritis ciliosa Gene R. Williams 1961-3-25 27 Colusa In Bear Valley, 8.4 miles north of turnoff from State Highway 20. Comment
  UC1018914  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 712 Colusa Colusa County Comment
  UC999837  Plectritis ciliosa subsp. ciliosa S. C. Dyal, A. Carter, E. Crum 1938-5-7 711 Colusa Colusa County Comment
  HSC65997  Plectritis congesta D. Boyd, M. Eichelberger, Tim Messick, T. Ranker 1980-4-20 45 Colusa Leesville Rd. from Leesville to Williams, 3.8 mi. E of Leesville. Comment
  CDA32826  Plectritis congesta subsp. brachystemon P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  CHSC62949  Plectritis macrocera Vernon H. Oswald; Lowell Ahart 1994-4-6 6067 A Colusa Goat Mtn. Rd. at Sullivan Creek, 1.2 mi SW of Digger Pine Flat. S of Stonyford. 469 Comment
  UC1543197  Poa Donald G. Nelson et. al. 1940-6-8 687 Colusa e summit of Snow Mt 1981 Comment
  CAS-BOT-BC244355  Poa annua Roxana S. Ferris 1926-4-21 6304 Colusa Near Sycamore Comment
  UC1108833  Poa annua Herbert L. Mason 1947-3-29 13152 Colusa ca 3 mi ne Colusa (Butte Sink, along Butte Creek) Comment
  UCD163710  Poa annua Craig Thomsen 1999-5-10 2022 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  CHSC115384  Poa bulbosa Lowell Ahart 2015-4-1 19991 Colusa Burned over in 2012, rocky serpentine outcrop on the north side of State Highway 20, 1/2 mile east of Lake County Line, 12 miles (air) east-northeast of Clear Lake (town), 17 miles (air) west of Williams. Inner Coast Range. 520 Comment
  UCD57879  Poa bulbosa Gordon Harrington; Diana Hickson, Jack Alderson 2007-4-29 54 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. About 250 feet north of Road Kill Cafe in flat meadow-pasture area. 385 Comment
  UCD64418  Poa bulbosa Craig D. Thomsen 2000-3-11 2166 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCD97127  Poa bulbosa Ellen Dean; G. Harrington, J. Alderson 2011-4-10 6911 Colusa Along Bear Valley Road at the Cal Fire station. 335 Comment
  SEINET11686444  Poa bulbosa var. vivipara S. M. Leary 1978-1 3 Colusa N side of Salt Creek, S side of Hwy 20, 11 mi WSW of Williams 143 Comment
  CAS-BOT-BC236333  Poa secunda subsp. secunda Roxana S. Ferris 1917-4-14 575 Colusa Arbuckle - Rumsey Road. Foothills W of Arbuckle Comment
  JEPS80396  Poa secunda subsp. secunda L. R. Heckard and J. Hickman 1981-6-22 5629 Colusa below (s of) Dark Hollow trail Snow Mt 1981 Comment
  JEPS80447  Poa secunda subsp. secunda L. R. Heckard with J. Hickman 1980-9-15 5438 Colusa n of road at Summit Springs; Snow Mt 1569 Comment
  SEINET3375126 Image available Polygala cornuta var. cornuta Marcus E. Jones 1882-7-3 3316 Colusa Colfax Comment
  UC1192334  Polygonum amphibium var. emersum Herbert L. Mason and Verne Grant 1946-8-6 12970 Colusa pond 2.7 mi n Colusa (between Sacramento River and Butte Creek); Butte Sink Comment
  CHSC84938  Polygonum aviculare Lowell Ahart 2003-10-23 10657 Colusa Along Squaw Creek, just south of East Park Reservoir, about 1/8 mile northwest of Sites Lodoga Road, about 1 mile north of Lodoga, about 21 miles west of Maxwell. 368 Comment
  CHSC85960  Polygonum aviculare Jenny Marr; Caroline Warren 1998-5-4 Colusa Vicinity of Sites, Stone Corral Creek, and Antelope Valley. 106 Comment
  CAS-BOT-BC413964  Polygonum aviculare subsp. aviculare Roxana Stinchfield 1916-7-11 457 Colusa Sycamore Comment
  CAS-BOT-BC413965  Polygonum aviculare subsp. aviculare Roxana Stinchfield 1916-6-17 292 Colusa Near College City Comment
  JEPS75752  Polygonum parryi L. R. Heckard and R. Bacigalupi 1976-9-6 4433 Colusa just e Fouts Camp; Snow Mt. 1859 Comment
  JEPS108782  Polygonum persicaria Lowell Ahart 2006-9-26 13354 Colusa Along the deep ditch, south side of the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  UC1299697  Polygonum sawatchense subsp. sawatchense Freed W. Hoffman 1948-6-27 2528 Colusa 8.6 mi sw Fouts Spring (w Colusa Co.); Upper Letts Valley 1310 Comment
  CDA28167  Polypogon interruptus L. Ahart 2006-8-9 13159 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. Comment
  UCD67067  Polypogon maritimus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5095 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western part of ranch along ridge trail at Cache Creek Canyon. Just south of junction with trail that leads east to Brophy Canyon and Thompson Creek. 494 Comment
  UCD91185  Polypogon maritimus Beecher Crampton 1958-5-19 4810 Colusa West of Lodoga. Little Stony Creek. Comment
  UCR228273  Polypogon maritimus Ellen Dean, Gordon Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5065 Colusa BLM Payne Ranch, lands to the southwest of the junction of Hwys 16 and 20. Northwest corner of ranch, along ridge trail on the border of Lake and Colusa counties. East side of trail around stock pond 610 Comment
  CHSC94319  Polypogon monspeliensis Lowell Ahart 2006-8-9 13107 Colusa On the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  POM206735  Polypogon monspeliensis A. A. Heller 1902-5-19 5570 Colusa Near Colusa. Comment
  SBBG119883  Polypogon viridis L. Ahart 2006-8-9 13159 Colusa N side and under bridge across Stony Crk, just N of Stonyford 347 Comment
  JEPS75871  Polystichum imbricans subsp. imbricans L. R. Heckard 1974-9-9 3857 Colusa ca. 1/4 mi se Foutch Camp; Snow Mt. 1828 Comment
  JEPS127193  Polystichum munitum Lowell Ahart, John Dittes, Josephine Guardino 2016-2-14 20720 Colusa About 1/2 mile north of Letts Lake, about 1/2 mile south of the large campground, about 13 miles (air) southwest of Stonyford. Comment
  CAS-BOT-BC102381  Populus fremontii Roxana S. Ferris 1917-4-17 624 Colusa Sycamore, Sycamore Slough Comment
  UC1179041  Populus fremontii subsp. fremontii Herbert L. Mason 1947-3-29 13158 Colusa along Butte Creek ca 3 mi ne Colusa (Butte Sink); along Butte Creek, Butte Sink Comment
  CHSC43804  Potamogeton natans Vernon Oswald 1984-7-20 1624 Colusa Lily Pond n of Letts Lake in Mendocino National Forest. In a pool on a streamlet in the meadow. 1280 Comment
  UCD35976  Potamogeton nodosus Beecher Crampton 1963-8-5 6870 Colusa 1/4 mile E Cortena. Comment
  UCD81888  Potamogeton nodosus Ellen Dean; Bear Creek Ranch Grazing Committee 2009-6-19 5772 Colusa BLM Bear Creek (formerly Payne) Ranch. Lands to the SW of the junction of Hwys 16 and 20. Central part of ranch at large stock pond. 492 Comment
  CAS-BOT-BC453905  Potamogeton pectinatus Milo S. Baker 1946-9-3 11576 Colusa Between Sacramento and Colusa along Hiwy. Comment
  UCD67086  Potamogeton pusillus Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5108 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  RSA666315  Potentilla drummondii Barbara Ertter 1989-7-2 8627 Colusa Long Glade, a V shaped meadow S of Milk Ranch just W of snow Mt West, about 11 airmiles due W of Stonyford. 1957 Comment
  RSA0014801  Proboscidea louisianica Richard Snow 1958-8-3 672 Colusa Near State Highway 20, on the road to Leesville. Comment
  JEPS8022  Proboscidea louisianica subsp. louisianica Rimo Bacigalupi with L. R. Heckard 1951-8-6 3471 Colusa 4.6 mi nw Sites (along road between Sites and Lodoga) Comment
  UCD122109  Proboscidea louisianica subsp. louisianica Rimo Bacigalupi; L R. Heckard 1951-8-6 3471 Colusa along road between Sites and Lodoga, 4.6 mi. N.W. of Sites. Comment
  JEPS101449  Proboscidea lutea Dean W. Taylor 1999-8-10 17295 Colusa 1 mile South of Williams, field between Interstate 5 and Delphos Road (old highway), 150 meters southeast of Husted Road freeway overcrossing 29 Comment
  CHSC1582  Prunus emarginata F. Wigmore 1931-5-1 Colusa Stony Creek gorge. Comment
  JEPS80050  Prunus emarginata L. R. Heckard with J. Hickman 1979-6-15 5050 Colusa Snow Mountain, East trail from Frog Pond to cirque of east and w peaks Snow Mountain 1981 Comment
  UCD159336  Pseudognaphalium californicum D. S. Park; E. Dean 2010-6-5 120 Colusa Walker ridge, Cold Spring Mt. roadside on exposed slope. 935 Comment
  CHSC113055  Pseudognaphalium stramineum Lowell Ahart 2013-10-1 19070 Colusa Inner North Coast Range. Strand of East Park Reservoir, about 2 1/2 miles (air) southeast of Stonyford, about 2 1/2 miles northwest of Lodoga, about 10 miles (air) northwest of Sites. 364 Comment
  JEPS120796  Pseudognaphalium stramineum Lowell Ahart 2013-10-1 19070 Colusa Strand of East Park Reservoir, about 2.5 air miles SE of Stonyford, about 2.5 miles NW of Lodoga, about 10 air miles NW of Sites. Comment
  JEPS80806  Pseudotsuga menziesii var. menziesii L. R. Heckard and J. Hickman 1981-7-30 5777 Colusa along upper (e side) Miller Camp Meadow; Snow Mt. 1874 Comment
  CAS-BOT-BC361875  Psilocarphus tenellus Roxana S. Ferris 1917-4-19 692 Colusa Sycamore Slough Comment
  JEPS40463  Psilocarphus tenellus W. L. Jepson 1932-5-7 16267 Colusa Indian Valley Indian Valley (w Colusa County) 518 Comment
  UC638695  Psilocarphus tenellus Ethel Crum 1938-5-7 2010 Colusa 4.2 mi n Rumsey; Inner North Coast Range, Comanche Hills 254 Comment
  UCD163706  Psilocarphus tenellus Craig Thomsen 1999-5-10 2018 Colusa Colusa County. At confluence of Sulphur Creek and Bear Creek. About 3 miles north of Hwy 20. Comment
  UCD135314  Psilocarphus tenellus George F. Hrusa 1989-5-7 6087 Colusa slopes on north side above Little Stony Creek approximately 4 meters from intersection of Ceder Mountain Road and Stonyford-Lodoga Road. Comment
  CHSC80413  Pterostegia drymarioides Caroline Warren; Jenny Marr 1998-5-4 Colusa Viciniy of Sites and Stone Corral Creek. 91 Comment
  JEPS121101  Pterostegia drymarioides Lowell Ahart 2013-5-1 18669 Colusa On the E side of Bear Valley Road, about 2.5 road miles NW of intersection of Hwy 20 and Bear Valley Road. Comment
  UCD92227  Puccinellia simplex Beecher Crampton 1958-5-19 4824 Colusa Colusa County, 3 miles south of Maxwell, along U.S. Highway 99W. Comment
  JEPS80463  Pyrola aphylla Alice Q. Howard 1972-7-10 8 B Colusa Crossing trail from Fouts Camp to Box Springs, the highest of the two such areas on the north side of the ridge separating Trout and Paradise Creek. Snow Mountain 1676 Comment
  JEPS75762  Quercus L. R. Heckard, and R. Bacigalupi 1976-9-6 4451 Colusa Fouts Camp-Summit Spring trail Snow Mt. 1584 Comment
  UCD84509  Quercus X morehus Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6060 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  CDA16102  Quercus berberidifolia G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15251 Colusa North Coast Ranges; Goat Mtn. Rd., +/- 1/4 mi W of Pine Flat camp. 426 Comment
  UC993123  Quercus douglasii J. M. Tucker 1948-9-22 1869 Colusa 11.3 mi w Williams (beside road to Venado) Comment
  UCD57708  Quercus douglasii Daniel Chau; with Plant Biology 102 2007-4-29 3 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern part of ranch, ca. 2 road miles south of intersection of State Routes 20 and 16. Along unimproved road in the mouth of Craig Canyon. 313 Comment
  UCD41209  Quercus durata John Snelling 1986-5-17 3 - Colusa 5.7 mi. west of Stoneyford along Fouts Spring Road. Comment
  UCD45981  Quercus durata D. Sanchez-Mata 1996-7-3 s.n. Colusa Williams. Walker Ridge. Wilburg Springs-Wintun Camp. Serpentine chaparral. 850 Comment
  UCD84514  Quercus durata Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6065 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  UCR52364  Quercus durata L. Blackford, S. Branch, D. Malm 1988-4-16 62 Colusa 6.1 mi. on Walker Ridge Road off Hwy 20 at Blue Oak campground 732 Comment
  CHSC105193  Quercus durata var. durata B. Castro; L. P. Janeway 1999-7-5 1016 Colusa Ca 11 air mi SSW of Stonyford, 5 mi NW of Indian Valley Reservoir, just N of Colusa/Lake Co line, near Bear Wallow Spring. In serpentine substrate on NNW-facing slope W of Lovelady Ridge rd ca 0.5 mi N of its jcn with USFS Rd 16N06, 0.6 mi NE of Pacific Point. 1051 Comment
  CDA16104  Quercus garryana var. garryana G. F. Hrusa, Dmitri Geltman (LE) 1999-8-18 15249 Colusa North Coast Ranges; Goat Mtn. 1706 Comment
  UC1051744  Quercus kelloggii Helen K. Sharsmith 1953-6-20 4300 Colusa n slope Goat Mountain; Inner North Coast Ranges, Mendocino National Forest 1828 Comment
  UCR201775  Quercus lobata George K. Helmkamp, E. A. Helmkamp 2008-10-14 14258 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  SBBG111415  Quercus palmeri J. M. Tucker 1991-8-19 4496 -a Colusa across Sulphur Crk from and SE of the hotel at Wilbur Springs 426 Comment
  UCD14525  Quercus palmeri Roger Raiche 1990-12-2 B Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14527  Quercus palmeri Roger Raiche 1990-12-2 D Colusa California, Colusa Co.; across Sulphur Creek from Wilbur Springs; Comment
  UCD14531  Quercus palmeri John M. Tucker 1991-8-19 4496 -C Colusa California, Colusa Co.; across Sulphur Creek from, and southeast of, the hotel at Wilbur Springs; Comment
  JEPS73455  Quercus vacciniifolia L. R. Heckard 1972-7-8 3056 Colusa se of Snow Mt.; West Peak 1981 Comment
  JEPS75737  Quercus vacciniifolia L. R. Heckard 1974-9-10 3886 Colusa s side upper reaches of Dark Hollow Creek; Snow Mt., Dark Hollow Creek 2042 Comment
  JEPS80248  Quercus wislizeni L. R. Heckard, and J. Hickman 1980-9-15 5427 Colusa below Summit Springs (Lake-Colusa County boundary); Snow Mt. 1524 Comment
  UCD144336  Quercus wislizeni var. frutescens G. F. Hrusa 1998-11-7 14905 Colusa Inner North Coast Ranges. Above Fouts Springs. Through Springs Road mile 2.7. 750 Comment
  UCD84512  Quercus wislizeni var. frutescens Ellen Dean; C. Thomsen, G. Harrington, R. Wilmarth, R. Wenk 2010-6-2 6063 Colusa Colusa County. On Lake County border. Walker Ridge. Along Walker Ridge Road, between Cold Spring and Buck Flat. 971 Comment
  HSC48162  Rafinesquia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3926 Colusa Along Bear Valley Rd. ca. 2 mi. from its junction with S.R. 20 366 Comment
  RSA275336  Rafinesquia californica Thomas W. Nelson, Jane P. Nelson 1978-4-29 3926 Colusa Growing along Bear Valley Road ca. 2 miles from junction with State Route 20. 366 Comment
  UC768665  Rafinesquia californica R. F. Hoover 1938-4-24 3211 Colusa Upper Sand Creek Comment
  JEPS80085  Ranunculus alismifolius L. R. Heckard with J. Hickman 1979-6-16 5092 Colusa about 1/2 mi s Milk Ranch (nw of West Peak, Snow Mt.) 2011 Comment
  UCD66942  Ranunculus aquatilis Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5091 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western side of ranch along trail that follows the border of Lake and Colusa counties. Dunsfield Flat stock pond. 628 Comment
  CHSC118888  Ranunculus arvensis David Isle; Ffrank Pendell 2017-5-17 2172 Colusa Foothills E edge of N Coast Range: W of Stonyford ~1.5 miles on 18N01.1 toFrank and Sheri Pendell Ranch; in black adobe pasture S of house ~1/8 mile. 381 Comment
  CAS-BOT-BC378937  Ranunculus californicus var. californicus Roxana Ferris 1926-4-21 6296 Colusa abandoned rice field 2 mi west of Colusa Comment
  POM163507  Ranunculus californicus var. rugulosus Roxana S. Ferris 1926-4-21 6296 Colusa Colusa County: abandoned rice field, 2 miles W of Colusa Comment
  UC1049533  Ranunculus canus Rimo Bacigalupi 1950-4-16 3125 Colusa about B.M. 1326 (along road down middle of valley, along creek); Bear Valley, Bear Creek Comment
  UCD163869  Ranunculus canus Craig D. Thomsen 2000-3-31 2078 a Colusa Bear Creek Botanical Management Area. Caltrans right-of-way on south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection. Comment
  UCR47929  Ranunculus canus Dave Read 1975-4-20 08 Colusa Inner Coastal Ranges. Bear Valley Road, 8.7 miles north of intersection with State Highway 20 412 Comment
  CAS-BOT-BC361306  Ranunculus canus var. canus Richard R. Halse 2013-3-26 8740 Colusa Along the Leesville Road ca. 5.6 miles NW of its junction with State Hwy 20, west of Williams. 157 Comment
  CHSC62943  Ranunculus hebecarpus Vernon H. Oswald; Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi NE of Digger Pine Flat, S of Stonyford. On a roadside bank. 463 Comment
  JEPS87655  Ranunculus hebecarpus Vernon H. Oswald and Lowell Ahart 1994-4-6 6057 Colusa Goat Mtn. Rd. 0.1 mi ne Digger Pine Flat (s of Stonyford) 463 Comment
  UCD57623  Ranunculus hebecarpus Joseph A. E. Stewart; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Craig Canyon. South side of unimproved road. 335 Comment
  HSC72141  Ranunculus occidentalis J. P. Smith, Thomas W. Nelson, Jane P. Nelson 1978-4-2 9573 Colusa Bear Valley Rd., 2.1 mi. from its junction with Hwy. 20 366 Comment
  UCD83757  Ranunculus occidentalis Ellen Dean; G. Harrington, K. Mawdsley, J. Shepard 2010-5-1 5953 Colusa Colusa County. Walker Ridge. Along Walker Ridge Road, Buck Flat. 875 Comment
  RSA268199  Ranunculus occidentalis var. eisenii Lyman Benson 1935-3-27 6327 Colusa 3 miles E of Lake County line Inner N coast, Sacramento River, Ukiah-Tahoe 610 Comment
  UCD97058  Ranunculus orthorhynchus var. bloomeri G. Thomas Robbins; S. Galen Smith 1950-4-15 1907 Colusa Bear Valley. Comment
  RSA730245  Raphanus raphanistrum R. R. Halse 2007-3-22 7104 Colusa Williams; by junction of 5th Street and B Street. 25 Comment
  RSA0115435  Raphanus sativus George K. Helmkamp, Elizabeth Helmkamp 2014-1-4 22509 Colusa Sacramento Valley: along CA-20 at Sycamore Cutoff, 1.3 miles west of the Sacramento River crossing. 20 Comment
  JEPS75868  Rhamnus californica L. R. Heckard 1974-9-10 3880 Colusa East Circle Trail, along spur running se from the w peak, Snow Mt. Snow Mt. 2011 Comment
  UCD57449  Rhamnus ilicifolia Gina Darin; with Plant Biology 102 2007-4-29 5 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Central part of ranch. Thompson Canyon. Along trail, north side of Thompson Creek. 373 Comment
  CDA15463  Rhamnus tomentella subsp. crassifolia G. F. Hrusa, WTD 1998-6-19 14599 Colusa North Coast Ranges; Little Stony Creek. Goat Mtn. Rd. ~ 1 km. W of intersection with Lodoga-Stonyford Rd. Comment
  CHSC88560  Rhamnus tomentella subsp. crassifolia L. P. Janeway; B. Castro 2001-6-3 7096 Colusa Inner North Coast Ranges. Spring near head of Doyle Canyon on east side of Walker Ridge, about 2.7 km (air) south of Bartlett Springs Road. 799 Comment
  JEPS41964  Rhamnus tomentella subsp. crassifolia W. L. Jepson 1920-5-23 8975 Colusa hills w of Bear Valley (on grade over ridge to Indian Valley) Comment
  CDA40545  Rhamnus tomentella subsp. crassifolia P. S. Crane 1979-8-14 s.n. Colusa 4 miles west of Ladoga Road on Goat Mountain. 0 Comment
  JEPS41974  Rhamnus tomentella subsp. tomentella W. L. Jepson 1934-7-28 16746 Colusa hills near Cortina Valley; Inner North Coast Range Comment
  UCD117941  Rhododendron occidentale George F. Hrusa 1989-5-5 6066 Colusa Open margin of Little Stony Creek, along Rd. to Cedar Camp. 1.5 m. SW of intersection of Stonyford-Lodoga Rd. 470 Comment
  HSC71304  Rhus aromatica Thomas W. Nelson, Jane Nelson 1979-4-12 4622 Colusa Along Stony Creek below Digger Pine Campground Comment
  RSA403713  Rhus trilobata var. quinata Michelle Stevens 1979-4-14 30 Colusa Bear Valley Road, 3.9 miles north of State Route 20 412 Comment
  JEPS75751  Ribes lobbii L. R. Heckard and R. Bacigalupi 1976-9-6 4432 Colusa just w Fouts Camp; Snow Mt. 1859 Comment
  UCD80839  Ribes malvaceum Jack Alderson 2009-2-21 20 Colusa BLM Payne Ranch (Bear Creek Ranch), lands to the SW of intersection of Hwys 16 and 20. Brophy Canyon. 304 Comment
  HSC94175  Ribes malvaceum var. malvaceum A. Skelly, G. McCabe, B. Bletcher 1996-3-30 4 Colusa 1.6 mi. W of Bear Valley Rd. and Brim Rd. on Brim Rd., 14.7 mi. on Walker Ridge Rd. to Brim Rd., 57 mi. E of Hwy. 101 on Hwy. 20, Leesville Comment
  SEINET12217802  Ribes quercetorum Unknown 1987-1 70029 Colusa W of Williams, Bear Valley, Bear Valley Rd, ca 0.5 mi NE of intersection with Brim Rd 433 Comment
  CAS-BOT-BC293684  Ribes roezlii Mona Bourell 1997-3-29 5770 Colusa Mendocino National Forest. Dixie Glade Campground 918 Comment
  CHSC90878  Ribes roezlii D. Isle 2003-6-24 214 Colusa Mendocino National Forest--North Coast Ranges. Little Stony Creek Watershed. UTM's: 10S 0523825E 4346753N. 1767 Comment
  RSA0034162  Ribes roezlii M. Bourell 1997-3-29 5770 Colusa Mendocino National Forest. Dixie Glade Campground. 918 Comment
  CAS-BOT-BC173956  Ribes viscosissimum Volney Rattan 1884-6-1 s.n. Colusa Black Butte. Coast Mts. North of San Francisco Bay Comment
  CDA33839  Ricinus communis David Brown 2010-10-13 PDR# 1552532 Colusa 0 Comment
  CHSC79693  Rigiopappus leptocladus L. P. Janeway; B. Castro 2000-5-1 6689 Colusa Vicinity of Grapevine Creek and Sites-Lodoga Road. 243 Comment
  CHSC86870  Rigiopappus leptocladus B. Castro; Beth Hendrickson 2003-4-7 1418 Colusa Vicinity of Sites, hills N of the Sites-Lodoga Rd, and Grapevine Creek. 167 Comment
  HSC62787  Rigiopappus leptocladus J. M. DiTomaso 1979-4-14 876 Colusa Bear Valley Rd., 3.9 mi. N of S.R. 20, next to Bear Creek. 412 Comment
  UCD163332  Rigiopappus leptocladus Craig D. Thomsen 2009-5-3 2801 Colusa Walker Ridge. Vicinity of Walker Ridge Rd., about 0.5 miles north of Hwy 20. Comment
  UCD166310  Rigiopappus leptocladus Jack Major 1962-4-28 806 Colusa At entrance to Bear Valley. (Exact location unknown. Coordinates estimated by label maker.) 381 Comment
  UCR201553  Rosa californica George K. Helmkamp, E. A. Helmkamp 2008-10-14 14262 Colusa Sacramento Valley, along River Road (generally following the Sacramento River), 1.1 miles north of Colusa 18 Comment
  SEINET8723619 Image available Rosa gymnocarpa Helen K. Sharsmith 1953-1 4405 Colusa Near Old Mill Camp, Trough Springs Ridge, Mendocino National Forest. 1036 Comment
  CAS-BOT-BC158728  Rubus ursinus Roxana Stinchfield 1916-7-8 381 Colusa Sycamore Slough, Stinchfield Ranch Comment
  UCR206365  Rumex pulcher George K. Helmkamp, E. A. Helmkamp 2009-5-20 14745 Colusa Inner North Coast Ranges, along CA-16 at 'Cowboy Camp' 1.0 mile south of the junction with CA-20, adjacent to Bear Creek 332 Comment
  UCD81731  Rumex salicifolius Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5733 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 864 Comment
  CDA2395  Saccharum ravennae Gordon Leppig 2001-3-29 1541 Colusa Route 16, 100 meters east of mile marker 4.58. 0 Comment
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Jul 31 2014
  UC72585  Sagina apetala Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  POM313039  Sagittaria calycina H. L. Mason, Verne Grant 1946-8-6 12961 Colusa Pond on Colusa-Marysville Hwy, 4 miles S of Colusa, west side of Sacramento River. Comment
  UC1178889  Sagittaria latifolia Herbert L. Mason 1945-9-19 12714 Colusa 1 mi n Colusa (on e side, below causeway, marshy bank of the Sacramento River); marshy bank of the Sacramento River Comment
  UC1178890  Sagittaria latifolia Herbert L. Mason 1945-9-19 12713 Colusa 1 mi n Colusa (on e side, Marshy bank of the Sacramento River); bank of the Sacramento River Comment
  CHSC61041  Salicornia subterminalis Vernon H. Oswald; Mike Wolder, Joe Silveira 1993-7-26 5704 Colusa Colusa National Wildlife Refuge. Tract 7 just SW of the headquarters complex on O'Hair Rd., ca. 2 mi SW of Colusa. 12 Comment
  CHSC78975  Salicornia subterminalis Vernon H. Oswald; Joseph G. Silveira 2000-10-12 9979 Colusa Colusa National Wildlife Refuge. On the west side of Powell Slough 0.25 mi south-southwest of Refuge Headquarters. 15 Comment
  UCD163647  Salix breweri Craig Thomsen 1998-6-19 1943 Colusa Bear Valley. About 8.5 miles north of Hwy 20. Comment
  UCD63618  Salix breweri Craig D. Thomsen 1999-5-12 2032 Colusa BLM Payne Ranch. Approximately 0.5 mile southwest of intersection of Hwy 16 and Hwy 20. Along ephemeral drainage west of large hillslope/peak. Comment
  CHSC77371  Salix exigua Heidi West; Beth Hendrickson, Natalie Wight 1999-3-25 Colusa Vicinity of Sites and Sites-Ladoga Road. 109 Comment
  UCD163863  Salix exigua Craig D. Thomsen 2001-5-31 2548 Colusa Bear Creek Canyon south of Sulphur Creek confluence. About 3 miles north of Hwy 20. Comment
  UCD84434  Salix exigua Jack Alderson 2009-4-8 32 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  CAS-BOT-BC107840  Salix gooddingii Alice Eastwood 1921-4-11 10235 Colusa Colusa Comment
  CAS-BOT-BC104036  Salix hindsiana Roxana Stinchfield 1916-7-7 396 Colusa Sycamore Slough near Sycamore Comment
  UCD16133  Salix laevigata G. Robinson 1984-4-21 8 Colusa California. Colusa County: Bear Valley, 3.3 mi N of hwy 20, about 80-90 m W of Wilbur Springs Rd., top of rise above creek flood plain. 390 Comment
  UCD164151  Salix laevigata Craig Thomsen 2000-3-31 2045 Colusa Bear Creek Canyon. About 5 miles north of Hwy 20, about 0.5 mile south of Wilbur Bridge. Comment
  UCD164152  Salix laevigata Craig Thomsen 1999-4-27 2002 Colusa Bear Creek Canyon. About 5 miles north of Hwy 20, 0.25 mile south of Wilbur Bridge. Comment
  UCD84432  Salix laevigata Jack Alderson 2009-4-8 34 Colusa BLM Bear Creek Ranch (Previously Payne Ranch). Lands to the SW of jct of Hwys 16 and 20. Brophy Canyon. 304 Comment
  UCR198150  Salix laevigata Ellen Dean, C. Thomsen, S. Bledsoe, J. Alderson, M. Starbuck 2007-4-7 3677 Colusa BLM Payne Ranch, lands to the southwest of junction of Hwy 20 and Hwy 16. Thomposon Canyon, near juncture with Craig Canyon 363 Comment
  UCR243136  Salix laevigata G. Robinson 1984-4-21 8 Colusa Inner North Coast Range, Bear Valley, 3.3 miles north of Hwy 20, about 80-90 m west of Wilbur Springs Rd. 390 Comment
  CDA16095  Salix lasiolepis G. F. Hrusa 1999-5-16 15048 Colusa North Coast Ranges; Goat Mountain on S side. 1722 Comment
  CDA16096  Salix lasiolepis G. F. Hrusa 1999-5-16 15047 Colusa North Coast Ranges; Goat Mountain on S side. At intersection of rd to Young's Corral and Goat Mtn Lookout. 1737 Comment
  CHSC114706  Salix lasiolepis G. F. Hrusa 1999-5-16 15047 Colusa Below ridge of summit of Goat Mountain on S side. At intersection of rd to Young's Corral and Goat Mtn Lookout. UTM: 10S, 4347149N, 0523426E. 1737 Comment
  UC1179040  Salix lasiolepis Herbert L. Mason 1947-3-29 13154 Colusa ca. 3 mi ne Colusa; Butte Sink, Butte Creek Comment
  UCD111629  Salix lasiolepis G. F. Hrusa 1996-2-26 12636 Colusa Little Stony Creek, Goat Mtn. Rd. approx. 3 miles SW of intersection with Stonyford-Lodoga Rd. 475 Comment
  UCD81257  Salix lasiolepis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5422 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Just north of the road leading up from the confluence of Bear and Cache Creeks. 323 Comment
  CHSC112002  Salix lasiolepis David Isle; David Toren 2003-6-24 2128 Colusa NE border of Veratrum spring and mdw, 1/4 mi E of Goat Mtn Rd 16N03 jct w/Horse Glade rd; (with flowing water). 1670 Comment
  CDA20233  Salsola australis P. Akers 2003-10-7 s.n. Colusa Sacramento Valley; 5th St and Hillgate Rd, Arbuckle, just E of Hwy 5 behind Shell Stn on RR tracks. 42 Comment
  CHSC101508  Salsola australis P. Akers 2003-10-7 Colusa 5th St. and Hillgate Rd., Arbuckle, just e of Hwy 5 behind Shell Station on RR tracks. Comment
  CHSC108062  Salsola soda B. Castro; Dave Boegner 2011-9-1 1913 Colusa Sacramento Valley. Larkins Childrens Rancho. 10 air mi NW of Colusa, 3 mi W of the Sacramento River and 800 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Uncommon along outer western edge of managed +- saline wetland of Gunnersfeld Ranch duck hunting club. 17 Comment
  JEPS110510  Salsola soda Lowell Ahart 2006-9-26 13348 Colusa Between the deep ditch and the Delevan National Wildlife Refuge, north side of Maxwell Road, about 3 miles west of Colusa Princeton Road, about 5 1/2 miles east of Maxwell 24 Comment
  JEPS118679  Salsola soda B. Castro with Dave Bogener 2011-9-1 1913 Colusa Sacramento Valley. 10 air mi W of the Sacramento River and 800 ft N of the northern boundary of Delevan NWR. Near where Hunters and Logan Creeks empty into the Colusa Basin Drain. Moulton Weir 7.5' quad. Comment
  CDA12015  Salvia columbariae G. F. Hrusa 1990-4-8 7667 Colusa North Coast Biodiversity Arena; Road into Bear Valley from the S, passing Wilbur Springs, and originating at Hwy. 20. Comment
  CHSC19702  Salvia columbariae L. A. Wright Jr. 1971-3-27 7 Colusa Scattered ca. 7 mi w of Williams on Hwy 20. Comment
  CHSC27518  Salvia columbariae Michael F. Henetz 1978-4-15 16 Colusa Ca. 65 m n of Salt Creek, ca 15 m n of Hwy. 20, ca. 17.7 km wsw of Williams. 143 Comment
  CHSC27525  Salvia columbariae Greg C. Halcomb 1978-4-9 10 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi wsw of Williams. 143 Comment
  HSC45671  Salvia columbariae Stephen Plant 1978-4-22 206 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  HSC85862  Salvia columbariae R. Earing, C. Cavanaugh, C. Collins 1987-4-12 86 Colusa Leesville Grade Comment
  UCD70242  Salvia mellifera D. Sanchez-Mata 1998-7-9 s.n. Colusa Bear Valley. Destanella Flat-Walker Ridge. Open serpentine chaparral (Ceanotho albiflori-Quercetum duratae Sanchez-Mata, Barbour and Rodriguez in Rivas-Martinez 1997). 450 Comment
  JEPS73506  Sambucus mexicana L. R. Heckard 1972-7-10 3123 Colusa e Trout Creek crossing (on trail to Box Springs); Snow Mt. 1828 Comment
  RSA60351  Sambucus mexicana G. R. Campbell 1948-6-18 652 Colusa 2 miles south of Wilbur Springs Comment
  CAS-BOT-BC238629  Sambucus nigra subsp. caerulea Roxana S. Ferris 1917-4-15 622 Colusa Sacramento River levee near Sycamore Slough Comment
  UC1053451  Sanicula bipinnata Rimo Bacigalupi, Arthur Holmgren 1950-4-26 3170 Colusa 7.7 mi w of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC2029557  Sanicula bipinnata Richard R. Halse 2013-3-26 8741 Colusa Along the Leesville Road ca. 8.3 miles northwest of its junction with State Highway 20 west of Williams, or 4.8 miles southeast of the junction with Bear Valley Road Comment
  CAS-BOT-BC223208  Sanicula bipinnatifida Roxana S. Ferris 1917-4-14 589 Colusa 5 mi west of Arbuckle, Arbuckle-Rumsey Road Comment
  CHSC81212  Sanicula bipinnatifida J. Trizzino 2001-3-31 15 Colusa Bear Valley Meadow along east side of Bear Valley Road. 396 Comment
  UCD163673  Sanicula bipinnatifida Craig Thomsen 1999-4-15 1974 Colusa Bear Valley. About 5 miles north of Hwy 20, west of Bear Valley Rd. Comment
  UCD56944  Sanicula bipinnatifida Ellen Dean; Gordon Harrington and Kate Mawdsley 2007-3-30 3546 Colusa BLM Payne Ranch. On west side of Hwy. 16. 2 road miles south of intersection with Hwy. 20. 312 Comment
  CDA34108  Sanicula bipinnatifida P. Hiatt 1979-4-26 Colusa North end of Bear Valley at Bartlett Springs Road. 0 Comment
  JEPS951  Sanicula tuberosa W. L. Jepson 1932-5-8 16274 Colusa Lodoga, w Colusa County Lodoga Comment
  UCD66606  Sanicula tuberosa Craig D. Thomsen 2000-5-11 2282 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, between Colusa Co. milepost 2.63 and 2.17. 325 Comment
  UCD82861  Sanicula tuberosa Gordon Harrington 2008-4-13 72 Colusa BLM Payne Ranch. Slopes to the SW of junction of Hwy 16 and Hwy 20. E of unnamed creek (flowing now). 385 Comment
  UCR206666  Scandix pecten-veneris George K. Helmkamp, E. A. Helmkamp 2009-3-17 14390 Colusa Inner North Coast Ranges Foothills, along CA-16 and Bear Creek, 4.3 miles south of the junction with CA-20 261 Comment
  UCD67087  Schoenoplectus acutus var. occidentalis Ellen Dean; G. Harrington, J. Alderson, E. Bayon, R. Willmarth 2008-6-8 5109 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Western edge of ranch on ridge above Cache Creek Canyon. Spring-fed stock pond at base of uphill climb east side of ridge trail. 510 Comment
  HSC79767  Schoenoplectus acutus var. occidentalis E. Parreno 1968-3-29 45 Colusa Below turnoff on Hwy. 20, 1 mi. W of intersection of Hwy. 20 and Hwy. 16 Comment
  CHSC46320  Schoenoplectus pungens Vernon Oswald 1989-6-3 3795 Colusa Little Stony Creek at the mouth of Frenzl Creek, ca. 6 mi s of Stonyford, north edge of Frenzel Creek Research Natural Area, Mendocino National Forest. 426 Comment
  UCD72538  Schoenoplectus pungens Ellen Dean; J. Alderson, N. Voegtly, and C. Thomsen 2007-5-12 3829 Colusa BLM Payne Ranch, lands to the SW of jct of Hwys 16 and 20. Area of ranch west of Hwy 16, near bridge that spans Bear Creek, ca. 4.5 road miles south of junction of Hwy 16/20. West side of Bear Creek, ca. 0.25 mile downstream of bridge. 251 Comment
  JEPS95824  Schoenoplectus pungens var. longispicatus Vernon H. Oswald and L. Ahart 1999-6-22 9772 Colusa Fouts Springs Rd. (M10) 6.7 mi west of Stonyford-Elk Creek Rd.: T18N R7W Sect. 33, 1960 ft, chaparral, serpentine substrate 597 Comment
  CHSC94324  Scirpus diffusus Lowell Ahart 2006-7-25 13062 Colusa In the west part of a large wet meadow and bog, about 20 yards east of the poor dirt road, about 100 yards south of the cabin, about 3/4 mile (air) northwest of Jonesville, about 5 miles (air) northeast of Butte Meadows. 1569 Comment
  CDA2621  Scirpus glaucus M. R. Pryor 1947-5-1 Colusa Grimes (col. near Biggs) 0 Comment
  CHSC86868  Scrophularia californica B. Castro 2003-4-10 1420 Colusa Vicinity of Logan Ridge, Sulphur Gap and Lurline Creek. Cutbank of dirt road. 131 Comment
  RSA589943  Scrophularia californica Michael A. Vincent, Robert M. Rhode 1996-3-30 7278 Colusa Along Bear Valley Rd. above Bear Creek, 1.4 mi. S jct. Wilbur Springs Rd. Comment
  UC71646  Scrophularia californica Miss Alice King 1905-1 Colusa College City Comment
  UC1562602  Scutellaria californica Barbara Ertter 1989-7-1 8617 Colusa 12 air mi wsw of Stonyford (road to Goat Mountain Lookout, 0.4 mi s of Rt M-10 (Bear Creek-Fouts Spring Rd) at head of South Fork Stony Creek); South Fork Stony Creek 1371 Comment
  UCD82582  Scutellaria californica Craig D. Thomsen; J. Wiegand, S. Harrison, G. Harrington, A. Fulks 2008-4-22 2727 Colusa Walker Ridge. Eaton Springs, 4 mi N of Hwy 20, ca. 1.5 mi E of Walker Ridge Rd. 609 Comment
  CHSC101618  Scutellaria tuberosa David W. Isle; Teal Richards 2002-4-18 1651 Colusa Mendocino National Forest. N of Fouts Springs, S of Chlorinator Building on road to Bathhouse Trail (Snow Mountain). SE aspect drainage in chamise chamassal site burned during 8/8/01 Trough Fire. Teal Richards-DI Reveg. Study Plot. MDB and M. 524 Comment
  UC71637  Scutellaria tuberosa Miss Alice King 1905-1 Colusa College City Comment
  HSC35372  Scutellaria tuberosa Robert M. Specht 1975-5-4 170 Colusa 1/2 mi. NE of Fouts Springs along Stoney Creek 488 Comment
  UCD163697  Secale cereale Craig Thomsen 1999-5-10 2003 Colusa Bear Valley. About 8 miles north of Hwy 20. Comment
  CAS-BOT-BC417046  Sedella pentandra Herbert L. Mason 1953-5-4 s.n. Colusa Little Stony Creek road 0.25 miles above junction of Little Stony Creek and Trout Creek,Inner North Coast Ranges 609 Comment
  UC1085313  Sedum laxum subsp. laxum Freed Hoffman July, 1947 Colusa rocky outcrops at summit Goat Mountain (western Colusa or eastern Lake County); summit Goat Mountain 1859 Comment
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Oct 29 2020
  JEPS73510  Sedum obtusatum subsp. boreale L. R. Heckard 1972-7-10 3128 A Colusa among rocks of promontory on se corner of Snow Mt. overlooking and 3 mi nw Fouts Springs; se corner Snow Mt., nw of Fouts Springs 1828 Comment
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Aug 17 2011
  UCD21584  Senecio flaccidus var. douglasii Craig D. Thomsen 2002-11-7 s. n. Colusa N. of Wilbur Hot Springs between Hot Springs gate and hotel. Confluence of Bear and Sulfur Creeks. Comment
  CDA11923  Senecio greenei G. F. Hrusa 1989-5-7 6078 Colusa North Coast Biodiversity Arena; N side of Little Stony Creek, approx. 3.7 miles upstream from intersection of Cedar Mtn. Rd. and Stonyford-Lodoga Rd. Comment
  CHSC94415  Senecio sylvaticus Lowell Ahart 2006-8-9 13158 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  UCD64278  Senecio vulgaris Craig D. Thomsen 2000-3-31 2082 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  CAS-BOT-BC364516  Senecio vulgaris Roxana S. Ferris 1926-4-21 6273 Colusa Sycamore Slough 2 miles west of Sycamore Comment
  CDA32942  Senecio vulgaris Doug Barbe & Phyllis Hiatt 1979-5-2 Colusa Williams; waste ground by Shell station. 0 Comment
  CAS-BOT-BC243614  Setaria pumila Milo S. Baker 1946-9-4 11602 Colusa Butte Sink, West Gridley Road Comment
  UCD92837  Setaria viridis Beecher Crampton 1958-6-26 4974 Colusa along Grieve Road, 5.5 miles south of College City. Comment
  UCD81249  Sherardia arvensis Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5413 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. South of the canyon that is located south of Brophy Canyon. 375 Comment
  SD27805  Sibara virginica Carl B. Wolf 1928-5-8 2125 Colusa Sacramento Valley, 3.0 miles south of Arbuckle. 39 Comment
  CHSC70984  Sidalcea diploscypha Vernon Oswald; Lowell Ahart 1998-5-7 9003 Colusa Bartlett Springs Rd. 2.1 mi west of Bear Valley Rd., 0.8 mi east of Sawtelle Valley and Grapevine Flat roads. 524 Comment
  UC71652  Sidalcea diploscypha Miss Alice King 1905-1 Colusa College City Comment
  UC725658  Sidalcea diploscypha A. A. Heller 1942-5-29 16480 Colusa along State Highway #20, 1/2 mi w of the junction with Highway #16 Comment
  UCD23423  Sidalcea diploscypha David Rhode 1977-4-30 22 Colusa Bear Valley, 2.1 miles north of Wilbur Springs. Dry gravel, west facing slope in sparse valley grassland pasture. Comment
  UC71634  Sidalcea hartwegii Miss Alice King 1905-1 Colusa College City Comment
  CHSC110123  Sidalcea keckii L. P. Janeway 2011-5-11 10278 Colusa Inner North Coast Ranges. Recreation area on southwest side of East Park Reservoir, 0.5 km south-southwest of the dam; 3.7 air km southeast of Stonyford. 374 Comment
  UC767046  Silene antirrhina R. F. Hoover 1938-4-24 3215 Colusa Sand Creek foothills w Arbuckle; Sand Creek foothills w of Arbuckle Comment
  UC583287  Silene californica Lewis S. Rose 1936-4-27 36179 Colusa 11 mi nw Rumsey; nw of Rumsey 304 Comment
  UC725702  Silene californica A. A. Heller 1937-4-24 15351 Colusa on State Highway #20, 15 mi w Williams; w of Williams Comment
  POM253020  Silene californica A. A. Heller 1937-4-24 15351 Colusa On Highway #20, 15 miles west of Williams. Comment
  POM914478  Silene californica L. S. Rose 1936-4-27 36179 Colusa 11 miles NW of Rumsey. 305 Comment
  UCD81714  Silene campanulata subsp. glandulosa Ellen Dean; K. Mawdsley,G. Harrington,R. Wilmarth,B. Rice,E. Salvia 2009-5-27 5720 Colusa Walker Ridge. Along Walker Ridge Road. Til Jones Spring area on W side of road, ca. 6.5 road mi N of junction with Hwy 20. W side of road. 833 Comment
  HSC62780  Silene campanulata subsp. glandulosa Thomas Wood 1979-4-14 108 Colusa 1067 Comment
  UCR37946  Silene gallica Brian Kearney, Mike Malamus, Peter Williams 1984-4-29 10 Colusa Bear Valley Road, 2 mi. north of Hwy 20. 366 Comment
  RSA0060081  Silene laciniata subsp. californica Richard R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road ca. 1.8 miles west northwest of its junction with State Hwy. 20. 378 Comment
  SEINET8879658  Silene laciniata subsp. californica R. R. Halse 2014-3-25 9036 Colusa Along the Bear Valley Road, ca 1.8 miles WNW of its junction with State Hwy 20. 378 Comment
  UCD56658  Silene laciniata subsp. californica Sam Bledsoe 2007-3-25 4 Colusa BLM Payne Ranch. Destinella Flat area, just E of the Lake County border, ca. 3.4 road miles along Hwy 20 from the junction of Hwy 16 and Hwy 20. South side of Hwy 20. 560 Comment
  UCD98993  Silene laciniata subsp. californica Cherry Kline 1964-5-2 51 Colusa Bear Creek Canyon, 3 miles north of the Wilbur Springs turnoff on State Highway 20. Comment
  SD22372  Silybum marianum Richard Neil 1938-6-20 Colusa Grimes Comment
  CAS-BOT-BC74903  Sinapis arvensis Roxana S. Ferris 1917-4-12 513 Colusa 4 mile east of Williams. Comment
  UCD61438  Sisymbrium altissimum Ellen Dean; G. Harrington, N. Voegtly, J. Alderson, C. Thomsen 2007-6-24 3883 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of Hwy 16 and Hwy 20. West of BLM equestrian parking lot (Cowboy Camp) on west side of Bear Creek. Approximately 1000 ft NNW of parking lot. 314 Comment
  UC10834  Sisymbrium officinale J. Burtt Davy May 1898 4273 Colusa near Willows Comment
  CHSC114941  Sisyrinchium bellum Lowell Ahart 2015-4-10 20012 Colusa In a small meadow, on the south side of Brim Road, about 2 miles west of the intersection of Bear ValleyRoad and Brim Road, about 17 miles (air) west of Williams. Meadow in Chaparral. 500 Comment
  HSC31401  Sisyrinchium bellum Maralyn O'Meara, Gary S. Lester 1974-5-4 349 Colusa Walker Ridge Rd., 0.7 mi. from junction with Little Indian Valley Rd. 854 Comment
  UCD138841  Sisyrinchium bellum Clinton C. Schock 1980-5-3 58 Colusa Bear Valley, around 12 miles northwest of Highway 20. 384 Comment
  UCD64292  Sisyrinchium bellum Craig D. Thomsen 2000-4-12 2134 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  HSC62938  Sisyrinchium bellum Michael Dalke 1979-4-14 49 Colusa Bear Valley Rd., 13 mi. N of Hwy. 20 396 Comment
  JEPS80060  Smilacina racemosa L. R. Heckard with J. Hickman 1979-6-15 5059 Colusa saddle trail between east peak and west peak Snow Mt 2103 Comment
  SEINET3887835  Smilacina racemosa var. amplexicaulis Barbara Bogert 1970-5-23 16 Colusa Bear Valley Road 2.5 miles north of State Highway 20.; 0 183 Comment
  POM62090  Solanum americanum Roxana Stinchfield 1916-7-7 385 Colusa Sycamore Slough bed. Stinchfield Ranch. Comment
  HSC42017  Solanum parishii M. A. Baker 1977-4-24 222 Colusa Walker Ridge Rd. above Barrel Springs Campground 701 Comment
  NY821077  Solanum parishii R. C. F. Bacigalupi 1950-4-25 3175 Colusa "Grapevine Grade" to Lodoga, ten miles northwest of Sites Comment
  NY723192  Solanum rostratum L. Ahart 1980-6-11 2370 Colusa 9¼ miles north of Colusa 35 Comment
  CAS-BOT-BC157051  Solanum umbelliferum R. J. Stinchfield 1916-6-18 299 Colusa Timber near College City Comment
  JEPS16203  Solanum umbelliferum Rimo Bacigalupi, Arthur Holmgren 1950-4-25 3175 Colusa 10 mi nw of Sites (Grapevine Grade to Lodoga); Grapevine Grade Comment
  UC1733755  Solanum umbelliferum Kay H. Beach 1940-5-16 658 Colusa Colusa and Lake county line Comment
  JEPS127581  Solidago velutina subsp. californica David Isle with Terril Wolt 2016-7-15 2168 Colusa North Coast Ranges: ~5 1/2 miles W of Stonyford off S side Fouts Springs Road M10 (18N01.2). Also ~5/8 mile SE of M10 Junction with Trough Sp R Rd M5 (18N07). Comment
  UCD82441  Solidago velutina subsp. californica Ellen Dean; G. Harrington, C. Thomsen,Chiao-Yi Cheng,R. Wilmarth 2009-5-20 5668 Colusa Walker Ridge. Along Walker Ridge Road, ca. 0.5 road mi N of intersection with road to Indian Valley Reservoir. Parking area, undeveloped roads, flats and slopes on W side of road. 869 Comment
  CHSC117781  Solidago velutina subsp. sparsiflora David Isle; Terril Wolt 2016-7-15 2168 Colusa North Coast Range:~5 1/2 miles W of Stonyford off S side Fouts Springs Rd M10 (18N01.2). Also ~5/8 mile SE of M10 Jct. w/ Trough Sp R Rd M5 (18N07.1) Fouts Spring California. 609 Comment
  UC1613356  Soliva sessilis Charles M. Belshaw Apr 1937 2873 Colusa vicinity Cook's Spring; Inner North Coast Range, Devil's Ridge Comment
  CAS-BOT-BC236520  Sorghum bicolor Mary L. Bowerman 1940-1-1 3836 Colusa Wall Point Trail, Mount Diablo Comment
  CAS-BOT-BC235306  Sorghum halepense Herbert L. Mason 1945-9-19 12723 Colusa Below causway over Butte Sink spillway, east bank of Sacramento River, 1 mile north of Colusa Comment
  CAS-BOT-BC390101  Spergularia bocconi A. A. Heller 1916-6-9 12392 Colusa Along the state highway near Colusa Comment
  CAS-BOT-BC390299  Spergularia macrotheca var. macrotheca Malcom A. Nobs; S. Galen Smith 1949-6-18 874 Colusa Highway 99W, near Delevan Comment
  CHSC53948  Spergularia marina Vernon H. Oswald 1991-4-21 4525 Colusa Two Mile Rd, 3.7 mi south of Maxwell Colusa Rd. On a flat along edge of road through rice fields. 27 Comment
  SEINET8883999  Spergularia marina R. R. Halse 2012-3-28 8455 Colusa Williams, along 5th Street between intersections with C and D Streets, near railroad tracks. 24 Comment
  UC625432  Spergularia marina G. B. and R. P. Rossbach 1938-5-31 636 Colusa 2 mi s Maxwell (near irrigation ditch) Comment
  CAS-BOT-BC390761  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 640 Colusa 3 3/4 mi. south of Maxwell Comment
  CAS-BOT-BC390766  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 641 Colusa 5 mi. west of Colusa Comment
  CAS-BOT-BC390769  Spergularia marina G. B. Rossbach; R. P. Rossbach 1938-5-31 637 Colusa 2 mi. so. of Maxwell Comment
  UCD81244  Stachys Ellen Dean; G. Harrington, R. Willmarth, B. Rice, and C. Thomson 2009-4-8 5408 Colusa BLM Bear Creek (Payne) Ranch. Lands to the SW of the intersection of Hwys. 16 and 20. Inside canyon that is located to the south of Brophy Canyon. 292 Comment
  SEINET9361561  Stachys ajugoides var. ajugoides Unknown 1999-8-18 15241 Colusa Bear Valley Comment
  CHSC80392  Stachys ajugoides var. rigida Caroline Warren; Jenny Marr, Heidi West, Natalie Wight 1998-6-11 Colusa Vicinity of Funks Creek and Logan Ridge. 106 Comment
  CHSC94516  Stachys ajugoides var. rigida Lowell Ahart 2006-8-22 13235 Colusa North side and under the bridge across Stony Creek, just north of Stonyford. 347 Comment
  JEPS110534  Stachys ajugoides var. rigida Lowell Ahart 2006-10-31 13539 Colusa On the south side of road M 10, about 6 miles by road west of Stonyford 583 Comment
  CHSC71433  Stachys albens Vernon H. Oswald; Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  CHSC75725  Stachys albens Vernon H. Oswald; Lowell Ahart 1999-6-22 9784 Colusa 1.5 mi west of Stonyford-Lodoga Road on County Road 42 paralleling Little Stony Creek. 359 Comment
  JEPS94680  Stachys albens Vernon H. Oswald and Lowell Ahart 1998-7-15 9268 Colusa Bartlett Springs Rd. 1.6 mi w Bear Valley Rd. 487 Comment
  UCD55468  Stachys albens Ellen Dean; Gordon Harrington 2006-10-6 3288 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Ranch can be accessed via north gate which is located on a road on the S side of State Route 20, 2.3 road miles W of jct of State Routes 16 and 20. In Thompson Canyon, along dirt road that parallels ephemeral drainage. 362 Comment
  UCD64039  Stachys albens Craig D. Thomsen 2000-6-23 2417 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, about 0.5 mile west of Hwy 20/16 instersection, Colusa Co. milepost 2.63. 304 Comment
  JEPS108769  Stachys pycnantha Lowell Ahart 2006-8-9 13092 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford 455 Comment
  CHSC61429  Stachys stricta Vernon H. Oswald 1993-8-16 5806 Colusa Sacramento National Wildlife Refuge. Refuge located ca. 7 mi S of Willows, W 1/4 of Tracts 44, near the S boundary of the refuge. Growing on N bank of Hunters Creek. 24 Comment
  UC72583  Stellaria media Miss M. Alice King 1905-1 Colusa near College City; Sacramento Valley Comment
  UCD64273  Stellaria media Craig D. Thomsen 2000-3-31 2074 Colusa Bear Creek Botanical Management Area. On Caltrans right-of-way, south side of Hwy 20, 0.25 mile west of Hwy 20/16 instersection, Colusa Co. milepost 3.00. 310 Comment
  UCR206676  Stellaria media George K. Helmkamp, E. A. Helmkamp 2009-1-31 14321 Colusa Sacramento Valley, Jameson Road 1.3 miles north of its junction with Lurline Road and south of Harbison Road, generally west of the city of Colusa 16 Comment
  CHSC62930  Stellaria nitens Vernon H. Oswald; Lowell Ahart 1994-4-6 6072 Colusa Goat Mtn. Rd. 0.8 mi S of Sullivan Creek Bridge, SW of Digger Pine Flat, S of Stonyford. On the edge of the road. 487 Comment
  JEPS80756  Stephanomeria lactucina L. R. Heckard and J. C. Hickman 1981-7-29 5723 Colusa spur about 1 km se Summit Springs (s side of Snow Mt.); Snow Mt. 1554 Comment
  CHSC94316  Stephanomeria paniculata Lowell Ahart 2006-8-9 13099 Colusa Gravel bar on the south side of Stony Creek, at Mine Camp, about 3 1/2 miles (air) west of Stonyford. 455 Comment
  UCD81218  Stephanomeria virgata Ellen Dean; K. Mawdsley, B. Rice, G. Harrington, and J. Alderson 2009-5-6 5555 Colusa Payne Ranch, lands to the SW of the jct. of Hwys. 16 and 20. Destinella Flat area on the S side of Hwy. 20. Ridges to the south of Destanella Flat. 483 Comment
  UCD72374  Streptanthus batrachopus A. M. Shapiro 1988-6-6 s.n. Colusa Goat Mountain Road. 762 Comment
  UC1733757  Streptanthus breweri Kay H. Beach 1940-5-16 1258 Colusa Colusa and Lake county line Comment
  UCD115959  Streptanthus breweri D. Sanchez-Mata 1998-6-24 s.n. Colusa Bear Valley. Bear Valley Road. Bear Valley Creek. 370 Comment
  UC956510  Streptanthus breweri var. breweri Freed W. Hoffman 1947-6-18 1019 Colusa Wilbur Springs Road Comment
  UC956517  Streptanthus breweri var. breweri Freed W. Hoffman 1948-6-28 2295 Colusa Fouts Springs-Letts Valley road 1.5 mi from Fouts Springs 579 Comment
  UC971991  Streptanthus breweri var. breweri Herbert L. Mason 1952-6-19 14300 Colusa area between Fouts Springs and Red Bridge Public Camp; Mendocino National Forest Comment
  UCD57659  Streptanthus breweri var. breweri Madeline Christopher; with Plant Biology 102 2007-4-29 2 Colusa Payne Ranch (owned by BLM), lands to the SW of the intersection of State Routes 20 and 16. Eastern/Central part of ranch. Craig Canyon. North side of unimproved road. 335 Comment
  UCR225264  Streptanthus breweri var. breweri Jack Alderson 2008-4-27 s.n. Colusa BLM Payne Ranch, lands to the southwest of the intersection of Hwys 20 and 16. Slopes to the west northwest of Cowboy Camp on the west side of Bear Creek. 428 Comment
  CHSC40533  Streptanthus glandulosus Jordan Detzer 1977-4-16 19 Colusa Salt Canyon, n side of Salt Creek, Hwy 20, 10 mi wsw of Williams. 143 Comment
  CHSC551  Streptanthus glandulosus 1932-4-1 Colusa Stony Ford. 396 Comment
  CHSC56756  Streptanthus glandulosus Joel Hoskins 1989-4-1 1 Colusa Ca. 5 yds n of Hwy 20, Salt Canyon, n side of Salt Creek, Hwy 20, 11 mi. wsw of Williams. 143 Comment
  HSC44457  Streptanthus glandulosus R. York 1978-4-22 127 Colusa Bear Valley Rd., 1.5 mi. from its junction with Hwy. 20 412 Comment
  UCD167944  Streptanthus morrisonii James Neilson 1982-7-1 4090 Colusa Frenzel Creek. (Exact location unknown. Coordinates estimated by label maker.) Comment
  UCR71158  Streptanthus morrisonii subsp. morrisonii L. F. LaPre 1986-5-30 s.n. Colusa Bartlet Springs Rd. 0.3 mi east of Lake Co. line 622 Comment
  UCR141627  Styrax officinalis var. californicus Roman Gankin 1959-4-19 330 Colusa Along road to Walker Ridge from Bear Valley Comment
  CHSC71005  Styrax officinalis var. redivivus Vernon Oswald; Lowell Ahart 1998-5-7 8996 Colusa Bartlett Springs Rd. 1.6 mi west of Bear Valley Rd. 487 Comment
  UC763185  Styrax officinalis var. redivivus R. F. Hoover 1941-5-2 4988 Colusa on Williams-Clear Lake highway just e Lake Co. line Comment
  HSC92004  Styrax redivivus S. Morrissette, J. Williams, K. Kopper 1994-4-24 25 Colusa Bear Valley Rd. 0.5 mi. S of junction with Brimm Rd. 457 Comment